Can anyone tell me what size the yoyofactory VK Axle is?
Sent from a galaxy far far away…
Take it to a hardware store. Most YYF use a 4 mm set screw, find one of the right length. If you can’t find a set screw buy a regular one and cut the head off. Smooth the cut end.
As a last resort you can always try contacting Yoyofactory. They might know the answer to your question. 
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