# 4a bearing maintenance

**URL:** https://forums.yoyoexpert.com/t/4a-bearing-maintenance/324346
**Category:** Yo-Yo Mods and Maintenance
**Created:** [July 16, 2020, 9:33pm UTC](https://forums.yoyoexpert.com/t/4a-bearing-maintenance/324346 "2020-07-16T21:33:18Z")
**Posts on this page:** 4
**Page:** 1

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### Author: ![Mystik](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.yoyoexpert.com/mystik/32/83294_2.png) [@Mystik](https://forums.yoyoexpert.com/u/Mystik)
#### Post date: [July 16, 2020, 9:33pm UTC](https://forums.yoyoexpert.com/t/4a-bearing-maintenance/324346/1 "2020-07-16T21:33:18Z")

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I’m just about ready to do some maintenance on my Offstring but am realizing I know very little about Offstring bearing sizes and type of lube. I having taken apart either of the 4a’s I own but they both look to have a slim bearing in there.

 ![15949350496316835372731578515130](https://us1.discourse-cdn.com/flex015/uploads/yoyoexpert1/original/4X/f/0/6/f0660bfe57a3cfa80de89efd28c8fed4e683aa4d.jpeg)  
I have a Duncan Skyhawk and YoYoFactory Airwave.

What type of lube do I need?

Anything I should know before I unintentionally butcher my throws?

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### Author: ![PCaliyoyos](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.yoyoexpert.com/pcaliyoyos/32/108396_2.png) [@PCaliyoyos](https://forums.yoyoexpert.com/u/PCaliyoyos)
#### Post date: [July 16, 2020, 9:36pm UTC](https://forums.yoyoexpert.com/t/4a-bearing-maintenance/324346/2 "2020-07-16T21:36:35Z")

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my offstring has a normal C size… have you compared it to a normal bearing?

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### Author: ![Mystik](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.yoyoexpert.com/mystik/32/83294_2.png) [@Mystik](https://forums.yoyoexpert.com/u/Mystik)
#### Post date: [July 17, 2020, 3:19am UTC](https://forums.yoyoexpert.com/t/4a-bearing-maintenance/324346/3 "2020-07-17T03:19:18Z")

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Havnt taken either apart.but they both look like either slim or recessed C size.

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### Author: ![oneofthenine](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.yoyoexpert.com/oneofthenine/32/81583_2.png) [@oneofthenine](https://forums.yoyoexpert.com/u/oneofthenine)
#### Post date: [July 17, 2020, 5:24am UTC](https://forums.yoyoexpert.com/t/4a-bearing-maintenance/324346/4 "2020-07-17T05:24:52Z")

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I have both, and they both use a regular size C bearing, no different from the standard. Most modern offstring yoyos use size C as well. The gap is just more narrow because the axle system allows the bearing to sink further into the shell than with 1a yoyos. I just use the same thin lube that I do on all my 1a throws. As with any yoyo, just don’t over tighten.  
Apparently, the skyhawk is compatible with a size A bearing if you flip the spacers, but I’ve never tried it. That could be fun to mess around with!