"Ya Chris, I only have 3/4" braces under those 1/2" floorboards. I was thinking the same thing, add another pc of 3/4" (just a block) that doug fir is tough stuff, and run the tube through the block, that will get the hole through the…"
"That layup link didnt work for me. Many years ago I made a 10" square for a small longshaft outboard motor to bolt onto the transom (someone stole my short shaft) out of 2-3/4" pcs of plywood. I used to troll alot in Lk St. Clair. It…"