I use a small slice of dowel. I epoxy or CA this inside the CF tube so that the screw will have meat to thread into. You can tap the wood for the machine screw

Another way is to insert a small block of ply with a blind nut attached to it...
These are all easily attached to the tube after the hole in the tub is drilled...This way the hole is aligned correctly.

What I use a small slice of dowel and drill it for a nylon insert. This nylon insert is actually the pushrod part of a nyrod..The yellow inner pushrod. The size that takes a 4-40 threaded insert to make the pushrod....I drill the dowel and insert the nyrod into the dowel and CA it in place. Its about a 1/2in to 3/4in peice of the pushrod material....Then use a small #4 sheet metal screw....I insert the dowel into a pre-drilled tube and capture it with the screw. The tube is not inside the wing...although it was when I drilled the hole in the tube. Use a washer and tighten the screw up to hold the dowel and nyrod assembly in place. Once held tight in place use a small amount of epoxy to hold the dowel....once dry then re-assemble on the wing...and use a slightly longer screw to get good capture into the nyrod material...The yellow nyrod material will act like a thread for the sheet metal screw and the screw will be self threading. Since the screw is tightened into the plastic it will not be vibration prone. If the nyrod ever strips out you simply drill it out and replace the nyrod material....It will work like a charm.

I have done this many times with success I use this same idea to hold on hatches, and belly pans....its simple...easily replaced if something goes wrong(stripped threads) and will not vibrate out.


Troy Newman