Let’s look at what the requirements are. Why a .010? Truly a great engine, but not ideal for trainers. A standard product engine has about the same power, but is infinitely more robust and forgiving of abuse.
Give us some more data on the original program situation, and we can give a lot more help, including some hardware, like as not.
If you need reduced power for limited space flying, there are several ways to achieve that. Cox left hand 6x2 prop, a disk blanking out part of the prop area, muffler, venturi restriction, the list goes on!
Give us more information on your goals, as a conrod replacement ain’t a’gonna happen.