Here's a post to sbrittons 25-46 mod which he did. Try to pm him and ask how they are holding up.
Originally Posted by sbritton
I'm doing the eFlite 25-46 metal retracts. The hole for the stut needs some drilling out, but really easy with the aluminum. The rest of the retract is slightly smaller than stock, so easily fits in the space provided.
Should be a really easy upgrade, rock solid but pricy. Worth it to have confidence the thing is not going to catch fire on you.