can someone tell me the size of yoyofactory hubstacks and the oring size for the hubstack…
normal a bearing
ive heard that the hubstack oring can wear down does this mean that at some point they will just snap
if so where could i find that oring without buying the hubstack set things
At such a small size, its harder to find. But, any harware store will have o-rings. Try a big department store. I worked at a small hardware store, and i dont believe we had such a small size.
Okay, let me see…
the diameter should be 5mm for the stack, and in a CAD, you’d do half, so 2.5mm
For the width, start off w/ a 4mm length, then add a groove after that for the O-ring to sit in (Spec for O-ring isn’t needed).
After you do that, add about a .5mm length after the gap for a bit of room.
It should look like this, minus the spike:
For the O-ring specs, if you have one of them, take them to the hardware store and see if they have them.
true value, 39 cents a pc. #60 1/4 x 1/8 x 1/16 
mine snapped today and this size fit perfect
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#60 1/4 x 1/8 x 1/16