I love the remote needle valves on the OS engines, but what I hate is the first engines that came out with them had the needle valve housing cast as part of the backplate of the engine. Any crash will break the needle valve off and require buying a new backplate. I tried to fix them but never found anything that worked well. On the 46 AX they got it right and made the mount a small piece of metal that could be bent back in shape, or reproduced quickly in the event of a crash.

Ken