Cutting access

[Matthewtanner 44]

I’ve moved to this thread because I think mine is a b or c. I’m missing the 3 out of 4 bushings in the push pull stringers for the elevator. The plan is to use a flanged 2 piece non metallic bushing that extends ~1.5 cm past the housing tube and hysol it in place keeping the bushing isolated in the housing. Now the question is where can I put an access panel to do this repair? Also, it could serve as a panel to remove the lead ballast in the tail and install my battery back there.