rossmick,
I sent a set of CJ main retracts back to the factory about a year ago. They acknowledged receipt of the package and then never responded to my emails about their status. I can under stand your frustration with this brand. I gave up and bought a new set of ROBARTS.
I had a bad landing with my P 51 2 weeks ago that tested the effectiveness of the wing mods I made. The nose over at the end of the rollout in the rough broke 3 blades and bent 1 strut tube. I found a crack in the glue joint under the gear mount rails but no wing damage. A similar landing last November trashed a stock wing that I still haven't got around to repairing.
Those Sierra gears look like a nice solution.