here's a small modification i've made to my CJ retrats. the spring to twist the retracts back into the well isn't strong enough, including increasing tension) and the wheen the wheels snap back (havn't had the cash to buy the adjsutable valve yet) they were getting stuck 1/2 rotated into the well.
it's just a piece of 4/40 scrap bent into an L with a loop for the mounting screw. now the rotation pin gets pushed into the retract position positively.

(sorry it's blurry, too much zoom)