As Robin says, do not drill through the floor. The tool that I saw listed in the CFTOs was basically a piece of brass roundstock drilled and tapped to accept the stud. As well, the end was tapered. You could then get in to the base of the stud and weld it in. I am planning to make up a few of these of various thread pitches and simply MIG them on.
Ideally I think you are supposed to heat up the armour a bit before welding so the weld does not crack away from the armour plate as it cools. I hope to be doing some of these this week, so I'll let you know how it goes. Primarily it will be the studs for the fenders to hull.
|