So I had .1227 scale chain from servo to rudder it did work but I was worried that it may be to light weight. So my Duca D Acosta kit from strike had .250 gears and chain in the kit. So I borrowed them and install in the Doria. I would like to find replacement gears. the chain is easy to find but the gear for the rudder has an 1/8 bore hole and a 440 set screw. I took a few photos. Let me know thanks
Stephen made them custom. Can get equivalent with a little work from servocity and McMaster if he has boxed them up by now.
I will emailing Stephen and check. I checked out servocity and the smallest is about 1 1/2” OD then you still have to mount it on a hub for a 1/8 bore. It gets tight in the stern sometimes.
https://www.servocity.com/motion-components/rotary-motion/sprockets-chain Servocity stocks .250 plastic chain and all sorts of sprockets and hub combinations to mount them to your choice of servos and shafts.