Wing
 

I poped out the # 10 blindnut and went to #8 /and switched to steel #8 allen head cap bolt /

Making a long driver with a filled epoxy brass tube witch I think was 3/16 (you need to match ) and will fit perfect
And then you only need a 3/16 hole under wing to reach .
Use the ball end type allen /that way it fit at a angle much better !

Good Luck RCTT