I am trying to adapt a set of Kyosho Optima wheels to fit an RC10 and was wondering if I could get some help with Kyoshos as I am not familiar with them.
On the back of a Kyosho Optima wheel is a recess for a hex nut to attach it to the axle and allow the power to be transferred.
-What size is this hex nut?
-Was an adaptor ever made to fit Kyosho Optima wheels to an RC10? Hot Trick maybe?
-Where can I get an adaptor or a Kyosho original nut to adapt?
Thanks in advance for all your help.

Cheers
Ed