Foaming fuse, interesting, but watch out for the added weight in the tail. Easy to make it too tail heavy.

On my Kadet, I have 1/4" hard balsa push rods with about 3" of 2-56 threaded rod on each end. Haven't flexed yet in about 20 years. Of course my Kadet is a mark I and don't know what changes were made in a mark II.

Later!