# grind machine help
**URL:** https://forums.yoyoexpert.com/t/grind-machine-help/76635
**Category:** Yo-Yo Mods and Maintenance
**Created:** [August 30, 2015, 4:34pm UTC](https://forums.yoyoexpert.com/t/grind-machine-help/76635 "2015-08-30T16:34:25Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@logickrazed](https://forums.yoyoexpert.com/u/logickrazed)
#### Post date: [August 30, 2015, 4:34pm UTC](https://forums.yoyoexpert.com/t/grind-machine-help/76635/1 "2015-08-30T16:34:25Z")
So I just started throwing not to long ago so I’m not to sure about some parts that I need. I recently got some parts from a grind machine, I have the shell, 2 hub stacks, and the black O-rings. Can someone tell me what all I need to fix it or is it even possible to find the parts I need?I would like to keep the hub stacks on it if possible, if not that’s fine to. Thank you in advance for anyone who helps.
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### Author:  [@YoYoExpertGarrett](https://forums.yoyoexpert.com/u/YoYoExpertGarrett)
#### Post date: [August 31, 2015, 2:05pm UTC](https://forums.yoyoexpert.com/t/grind-machine-help/76635/2 "2015-08-31T14:05:11Z")
When you say shell do you mean just the yo-yo itself? The grind machine comes with the two yo-yo halves which are held together by an axle (either 20 or 25mm I believe) and two PGM posts that fit like a hex nut on either side for the axle to screw into. You should also have a size C bearing and two 21mm broad pads installed.
For the hubstacks you’ll need two size A flat bearings, two o-rings, and two hubstacks. Bearings goes on the post first, then the o-ring, then the hubstack.
axle and PGM posts:
> **[YoYoFactory Axles](https://shop.yoyoexpert.com/products/yoyofactory-yoyo-axle)**
>
> These are replacement axles for your YoYoFactory yo-yos.Flea: Mighty Flea, Big Deal8mm MVP, BOSS, SuperNova LITE, SuperNova, Proton, New SuperStar, Space Cowboy, Horizon, Aviator 2, Too Hot10mm 44, 44 Special, 2010-2012 Superstar, Skyline, DNA,...
size A and size C bearings:
> **[YoYoFactory Bearings](https://shop.yoyoexpert.com/products/yyf-yoyo-bearing)**
>
> These are replacement bearings for your YoYoFactory yo-yos.The Small Spec Bearing is a high quality Size A (5x10x4 mm) stainless steel bearing yo-yo for small bearing compatible yo-yos.The Large Spec Bearing is a Size C (.250 x .500 x .187) and fits...
21mm broad pads:
> **[YoYoFactory Response Pads](https://shop.yoyoexpert.com/products/yoyofactory-yoyo-response)**
>
> These are YoYoFactory made response by the Central Bearing Company (CBC) built to fit the majority of yo-yos available today from a wide array of manufacturers. CBC "Slim Pad" Size 19mm OD are now available in different versions: White Pads:The...
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### Author:  [@logickrazed](https://forums.yoyoexpert.com/u/logickrazed)
#### Post date: [August 31, 2015, 7:36pm UTC](https://forums.yoyoexpert.com/t/grind-machine-help/76635/3 "2015-08-31T19:36:47Z")
yes, I was meaning the two halves of the yoyo itself, and thank you for the help