Swiss jeweled low powered pulse motors
Here is where you can find these sapphire vee jewel bearngs: https://www.swissjewel.com/product/jewel-bearings/vee-jewels/v3-18/
The size for the Lasersaber V2 (the black motor ) is V3.18
The size for the tiny spring loaded one (the white motor) is VS-30
They are expensive but worth it if you want to make a precision long running device,