ORIGINAL: vasek
Hi Mike, it's a ''shaped'' stab so it varies from about 1/2 '' to 3/4''.
It has been arched from prolonged storage. I've straitened it since, but it does have a bit of memory in it, thus the need for these carbon braces.
I want to drill through the rounded balsa tip and use hot straight wire for the inside styro, than gorilla glue the rod in.
Also, you could take a piece of 4-40 all thread rod work it back and forth like a file to bore a hole
Just a comment though,
IMO 1.5mm cf seams useless to me in the middle of 1/2"- 3/4" foam, the foam will flex around that small piece. I'd cut a 1/8" slot in the bottom and glue in a ply brace,
good luck