One Drop: Aren’t taking any customers for a while if not ever again. So that’s out of the picture.
Foxland: Alvin is an amazing machinist and can do anything. Best and basically only place you can get a Yoyo machined by someone experienced with yoyos. Foxland is quite pricy for prototypes but that’s how it is anywhere when they only make a few. Runs are a ton cheaper but prototyping is a must.
Using a machine ship that has never done yoyos is a risk but if they are knowledgeable and can machine to precision tolerances should be possible. Only downside besides the risk is the costs. Most machine shops will give you insane quotes since they aren’t aware of yoyoing and other prices of Yoyo machinists are cheaper than they would be able to machine at.