ORIGINAL: RCKen
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
Repairing the remote needle valve is relatively simple.
1st, THOROUGHLY clean all the metal in the area. I use several applications of acetone wiping it with a clean rag each time.
2nd. Depending on how it is broken, drill a small hole in each piece and insert a piece of 1/32" music wire into both halves (for strength ) and JB Weld in place. If it is not feasable to drill for the wire, take a piece of 1/4" (or smaller if needed ) brass flat stock and bend a "C" to fit snugly over/around the broken parts and JB Weld (again, for strength ).
Use the regular JB Weld, not the quick stuff - the regular is substantially stronger.
I have repaired several OS 46 FX (mine and other peoples ) like this and out of 8 repairs I only had one fail. I think the one that failed was due to me not getting it clean enough before JB Weld it. It doesn't look that pretty, but it works and is cheaper than a new backplate.