Hello all;

I have a few planes with retracts in them, mechanical type, which work OK(H9 Corsair & Hellcat) that I want to switch to Robart Oleo type.

How do I pick the right ones, what process do you use to determine which diameter fit the mechanical system?

How do you put together the system yourself, if you were picking parts from Tower for example. I am kind of reluctant to try becasue I dont want to spend on something that may not go together.

I bought a set of premade/kit CJ retracts for my top flite mustang, that was easy, but want to know how to pick myself.

any tips?

thanks very mcuh,

Joe