# Yoyojam Matrixx C bearing/dual silicone conversion **URL:** \ **Category:** Yo-Yo Mods and Maintenance\ **Created:** [November 18, 2013, 3:36am UTC](https://forums.yoyoexpert.com/t/yoyojam-matrixx-c-bearing-dual-silicone-conversion/61301 "2013-11-18T03:36:49Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![3yo3](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.yoyoexpert.com/3yo3/32/144_2.png) [@3yo3](https://forums.yoyoexpert.com/u/3yo3)\ **Post date:** [November 18, 2013, 3:36am UTC](https://forums.yoyoexpert.com/t/yoyojam-matrixx-c-bearing-dual-silicone-conversion/61301/1 "2013-11-18T03:36:49Z")
Hey guys, did one of these about 2 weeks ago, and shipped it off. Meant to take pics but forgot! Whoops! Guy really liked it, so much so that he sent 2 more to do!!! This time I decided to document it so I could show all of you, I’m sure there’s some, “yoyo gearheads” that want to check it out!! 2 Old (2003??) Yoyojam Matrixxs. I brought them to 2013 standard playability by converting to a C bearing & adding silicone. The tough part was the need to add an acrylic ring due to the fact the existing oring/silicone groove starts at ~0.510" diameter, and the bearing is 0.500", and we need approx 0.010" clearance… So the the ring is machined & laminated in place to basically add material. [https://fbcdn-sphotos-e-a.akamaihd.net/hphotos-ak-ash3/1462542\_10153476038590291\_67224653\_o.jpg](https://fbcdn-sphotos-e-a.akamaihd.net/hphotos-ak-ash3/1462542_10153476038590291_67224653_o.jpg) [https://fbcdn-sphotos-b-a.akamaihd.net/hphotos-ak-ash4/1403558\_10153476038520291\_1059292155\_o.jpg](https://fbcdn-sphotos-b-a.akamaihd.net/hphotos-ak-ash4/1403558_10153476038520291_1059292155_o.jpg) [https://fbcdn-sphotos-h-a.akamaihd.net/hphotos-ak-prn2/1398394\_10153476038565291\_875140390\_o.jpg](https://fbcdn-sphotos-h-a.akamaihd.net/hphotos-ak-prn2/1398394_10153476038565291_875140390_o.jpg) Check out that old bearing… 3/8" (0.375") Outerdiameter, vs the 0.500" of a C bearing [https://fbcdn-sphotos-c-a.akamaihd.net/hphotos-ak-prn2/1398930\_10153476039015291\_181829952\_o.jpg](https://fbcdn-sphotos-c-a.akamaihd.net/hphotos-ak-prn2/1398930_10153476039015291_181829952_o.jpg) First step was to highwall it. There was an adjustable gap, the way it worked was the bearing was able to really sink into this side, to a recession depth of near 0.057" or so. I chopped off 0.040", the result is approx a 4.1mm gap. [https://fbcdn-sphotos-a-a.akamaihd.net/hphotos-ak-frc3/1403620\_10153476039370291\_2004042570\_o.jpg](https://fbcdn-sphotos-a-a.akamaihd.net/hphotos-ak-frc3/1403620_10153476039370291_2004042570_o.jpg) both sides highwalled [https://fbcdn-sphotos-g-a.akamaihd.net/hphotos-ak-prn2/1397584\_10153476039495291\_1234960868\_o.jpg](https://fbcdn-sphotos-g-a.akamaihd.net/hphotos-ak-prn2/1397584_10153476039495291_1234960868_o.jpg) As mentioned earlier, that ID of the silicone/oring groove isn’t thick enough to support a C bearing as is. More material is required. The work around is actually getting more material in there. To do that I’ll use some acrylic stock, cut some rings to size & glue them in, joining them in as part of the yoyo, and then be able to carry on about the mod 🙂 ---
**Author:** ![3yo3](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.yoyoexpert.com/3yo3/32/144_2.png) [@3yo3](https://forums.yoyoexpert.com/u/3yo3)\ **Post date:** [November 18, 2013, 3:44am UTC](https://forums.yoyoexpert.com/t/yoyojam-matrixx-c-bearing-dual-silicone-conversion/61301/2 "2013-11-18T03:44:15Z")
[https://fbcdn-sphotos-h-a.akamaihd.net/hphotos-ak-prn2/1465917\_10153476039530291\_604110293\_o.jpg](https://fbcdn-sphotos-h-a.akamaihd.net/hphotos-ak-prn2/1465917_10153476039530291_604110293_o.jpg) I cut the ID of the groove to get a known dimension, that way I’m not dependent on the mold’s tolerance or other issues (making sure there’s no radius at the bottom of the groove, assuring parallel walls & no draft angle) [https://fbcdn-sphotos-b-a.akamaihd.net/hphotos-ak-frc3/1399475\_10153476039770291\_1566686583\_o.jpg](https://fbcdn-sphotos-b-a.akamaihd.net/hphotos-ak-frc3/1399475_10153476039770291_1566686583_o.jpg) Here’s the ring cut. It’s right at the ID of the response groove. Maybe a slight press fit. Some CA Glue and it bonds permanently haha. [https://fbcdn-sphotos-e-a.akamaihd.net/hphotos-ak-ash3/1403155\_10153476039945291\_649138790\_o.jpg](https://fbcdn-sphotos-e-a.akamaihd.net/hphotos-ak-ash3/1403155_10153476039945291_649138790_o.jpg) Here it is after being glued. Just glued it while on the lathe, then sawed the piece off from the bar stock [https://fbcdn-sphotos-c-a.akamaihd.net/hphotos-ak-frc1/904195\_10153476040025291\_1801599491\_o.jpg](https://fbcdn-sphotos-c-a.akamaihd.net/hphotos-ak-frc1/904195_10153476040025291_1801599491_o.jpg) After both have been sawed. Next step is to trim down to the same level as the face, & remove the red & blue original plastic to take up from a 3/8" clearance bore to a 1/2" clearance bore. [https://fbcdn-sphotos-a-a.akamaihd.net/hphotos-ak-prn2/1401894\_10153476040145291\_57765554\_o.jpg](https://fbcdn-sphotos-a-a.akamaihd.net/hphotos-ak-prn2/1401894_10153476040145291_57765554_o.jpg) Post facing, still have to bore it [https://fbcdn-sphotos-g-a.akamaihd.net/hphotos-ak-ash3/964981\_10153476040285291\_890150528\_o.jpg](https://fbcdn-sphotos-g-a.akamaihd.net/hphotos-ak-ash3/964981_10153476040285291_890150528_o.jpg) How it looks after being bored to accept C bearing [https://fbcdn-sphotos-f-a.akamaihd.net/hphotos-ak-ash4/1403309\_10153476040585291\_413397689\_o.jpg](https://fbcdn-sphotos-f-a.akamaihd.net/hphotos-ak-ash4/1403309_10153476040585291_413397689_o.jpg) Starburst side bored to accept C bearing. Also had to bring the face the bearing mates up to down to around 0.015" below flush, resulting in ~4.1mm gap [https://fbcdn-sphotos-d-a.akamaihd.net/hphotos-ak-frc3/1421244\_10153476041120291\_250845175\_o.jpg](https://fbcdn-sphotos-d-a.akamaihd.net/hphotos-ak-frc3/1421244_10153476041120291_250845175_o.jpg) Finished both halves!! [https://fbcdn-sphotos-b-a.akamaihd.net/hphotos-ak-frc3/1398800\_10153476041395291\_1914665807\_o.jpg](https://fbcdn-sphotos-b-a.akamaihd.net/hphotos-ak-frc3/1398800_10153476041395291_1914665807_o.jpg) Last step was to actually trim the height of the bearing trunion/post down by about 0.015" so that it doesn’t strike the other half of the yoyo, & the yoyo halves actually sandwich on the ID of the bearing. Hope you guys get a kick out of this!! Once the silicone dries I’ll be able to take em’ for a test drive. Til next time! Landon ---
**Author:** ![Jake\_Elliott](https://avatars.discourse-cdn.com/v4/letter/j/49beb7/32.png) [@Jake\_Elliott](https://forums.yoyoexpert.com/u/Jake_Elliott)\ **Post date:** [November 18, 2013, 12:27pm UTC](https://forums.yoyoexpert.com/t/yoyojam-matrixx-c-bearing-dual-silicone-conversion/61301/3 "2013-11-18T12:27:59Z")
That is extremely impressive work. ---
**Author:** ![jhb8426](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.yoyoexpert.com/jhb8426/32/631_2.png) [@jhb8426](https://forums.yoyoexpert.com/u/jhb8426)\ **Post date:** [November 19, 2013, 5:26am UTC](https://forums.yoyoexpert.com/t/yoyojam-matrixx-c-bearing-dual-silicone-conversion/61301/4 "2013-11-19T05:26:49Z")
Nice work. ---
**Author:** ![PlasticWhip](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.yoyoexpert.com/plasticwhip/32/896_2.png) [@PlasticWhip](https://forums.yoyoexpert.com/u/PlasticWhip)\ **Post date:** [November 20, 2013, 2:15am UTC](https://forums.yoyoexpert.com/t/yoyojam-matrixx-c-bearing-dual-silicone-conversion/61301/5 "2013-11-20T02:15:52Z")
You’re my hero.