[Arct1k]

The KB has I believe 30mm motor mount spacing which means it won't work with mikes mount.

It also uses a 6mm shaft so you will have difficulty with pinions - You may be able to get ones that have been drilled out but I doubt they will be hard enough to last against a steel spur.

That servo is good speed wise but light on torque - HS5595 are going for $80 why skimp after spending so much on a kit.

PS Worth checking EBAY I picked up my ST Pro for 406 shipped