my friend and i met some problem with yoyo design

General Yo-Yo
1

we don’t know how to measure the bearing set size and the response size ,any one give some advice or if you know the outer diametre and inner diametre of standard yoyojam and yoyorecreation yoyo 's response system and bearing set, pls tell us!

2

Calipers and micrometers are wonderful measurement tools and can give you the answers you seek…

db

3

Or measure the diameter and multiply it by pi XD

4

thanks a lot , i bought a digital caliper, it can handle depth ,inner and outer diametre and with only 100rmb, problem solved