Re: refurbishing interior of 77 Chieftain 22'
They make a threaded insert...1/4-20 that you put in the plywood, then the s.s. 1/4-20 round flat head screw... i seen them at H.D. and i also picked some up at ace hardware.
I also used the s.s fender washers and s.s. nylock nuts. The inserts are galvinized and i painted them before i put the fabric on.