# A working journey in bearing modifications
**URL:** https://forums.yoyoexpert.com/t/a-working-journey-in-bearing-modifications/414418
**Category:** Yo-Yo Mods and Maintenance
**Created:** [November 30, 2024, 9:10pm UTC](https://forums.yoyoexpert.com/t/a-working-journey-in-bearing-modifications/414418 "2024-11-30T21:10:29Z")
**Posts on this page:** 11
**Page:** 1
### Author:  [@hooty7734](https://forums.yoyoexpert.com/u/hooty7734)
#### Post date: [November 30, 2024, 9:10pm UTC](https://forums.yoyoexpert.com/t/a-working-journey-in-bearing-modifications/414418/1 "2024-11-30T21:10:30Z")
Updated 12/4
Hi all,
I’ve come to you to note the chronicles of making a customized bearing for any of interest.
Aiming for a hybrid bearing with steel races and nylon cage with ceramic balls.
_NEW Information_
I have now made a hybrid using 1/16 ZrO2 balls in a magic yoyo bearing which originally spun on a bearing tool for 5-6s out of package now to 17-18s. I have a feeling the tolerances on those races aren’t as good and I think I can achieve better spin times, as the kabo bearing nylon caged steel ball bearing spins on a tool 20-21s with little to no vibration. Next I will be putting Zr02 balls inside of those races with the nylon cage and one with a steel cage swapped from a RCS bearing which will get the nylon cage and Zr02 balls.
Testing has been done by repeated spins set up on a bearing removal tool after the bearing has been cleaned with 91% Isopropyl Alcohol and a compressed air gas canister.
As soon as you add a drop of oil to a clean bearing you will notice an immediate loss of spin time by ~3-4x, if sprayed with air up to high speed removing excess in the process it makes it ~1.5-2x, oil adds friction and deceleration.
Notes:
8 ball size A bearings use 1.2mm balls.
10 ball size C bearings use 1/16" balls.
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### Author:  [@hooty7734](https://forums.yoyoexpert.com/u/hooty7734)
#### Post date: [November 30, 2024, 9:10pm UTC](https://forums.yoyoexpert.com/t/a-working-journey-in-bearing-modifications/414418/2 "2024-11-30T21:10:40Z")
Reserved
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### Author:  [@hooty7734](https://forums.yoyoexpert.com/u/hooty7734)
#### Post date: [November 30, 2024, 9:10pm UTC](https://forums.yoyoexpert.com/t/a-working-journey-in-bearing-modifications/414418/3 "2024-11-30T21:10:57Z")
Reserved #2
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### Author:  [@Captrogers](https://forums.yoyoexpert.com/u/Captrogers)
#### Post date: [November 30, 2024, 9:25pm UTC](https://forums.yoyoexpert.com/t/a-working-journey-in-bearing-modifications/414418/4 "2024-11-30T21:25:50Z")
Neat do you have to use flats for this or are you able to get different shapes?
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### Author:  [@hooty7734](https://forums.yoyoexpert.com/u/hooty7734)
#### Post date: [November 30, 2024, 9:28pm UTC](https://forums.yoyoexpert.com/t/a-working-journey-in-bearing-modifications/414418/5 "2024-11-30T21:28:16Z")
I’m using another cheaper bearing with a concave for the race.
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### Author:  [@Captrogers](https://forums.yoyoexpert.com/u/Captrogers)
#### Post date: [November 30, 2024, 9:32pm UTC](https://forums.yoyoexpert.com/t/a-working-journey-in-bearing-modifications/414418/6 "2024-11-30T21:32:21Z")
Nice I’ve tried and failed at making a groove in a few bearings but reusing a cheap concave race is probably going to work better.
Looking forward to seeing how this progresses. Would be cool to upgrade some cheap magic yoyo bearing to hybrids
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### Author:  [@hooty7734](https://forums.yoyoexpert.com/u/hooty7734)
#### Post date: [November 30, 2024, 9:39pm UTC](https://forums.yoyoexpert.com/t/a-working-journey-in-bearing-modifications/414418/7 "2024-11-30T21:39:43Z")
For the nylon cage I’m also using a cheap alternative bearing. I don’t see many yoyo bearings with a nylon cage but it is definitely better than a steel crimped cage.
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### Author:  [@Splizacular](https://forums.yoyoexpert.com/u/Splizacular)
#### Post date: [December 1, 2024, 1:13pm UTC](https://forums.yoyoexpert.com/t/a-working-journey-in-bearing-modifications/414418/8 "2024-12-01T13:13:18Z")
> [@hooty7734](#):
>
> Amazon may loose your package because someone may think it is empty
kinda bold of them. who cares if its empty?! if amazon got paid to deliver an empty box, deliver an empty box! lol ppl are weird
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### Author:  [@hooty7734](https://forums.yoyoexpert.com/u/hooty7734)
#### Post date: [December 1, 2024, 1:17pm UTC](https://forums.yoyoexpert.com/t/a-working-journey-in-bearing-modifications/414418/9 "2024-12-01T13:17:40Z")
Eh it’s just my assumption, idk what happened to it actually, but the balls are so small one could think it’s an empty bubble mailer.
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### Author:  [@SlowThrow](https://forums.yoyoexpert.com/u/SlowThrow)
#### Post date: [December 1, 2024, 1:37pm UTC](https://forums.yoyoexpert.com/t/a-working-journey-in-bearing-modifications/414418/10 "2024-12-01T13:37:47Z")
I’ve also had “light” packages disappear lol, watch parts, and bike cable end crimps.
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### Author:  [@hooty7734](https://forums.yoyoexpert.com/u/hooty7734)
#### Post date: [December 4, 2024, 9:26pm UTC](https://forums.yoyoexpert.com/t/a-working-journey-in-bearing-modifications/414418/11 "2024-12-04T21:26:19Z")
Updated Bumper