RE: Airtronics Servos
Sigh
Go to Tower Hobbies
try LXHWP7, LXEKC1 and LKEKC2
there are others, but I have used these and they are built for Airtronics splines or have inserts available for Aritronics splines.
Frankly this spline stuff is for the birds. Why so many flavors? Yeah, I know.