Originally Posted by GrahamO
I need to mount a couple of plates on my transom for my davits. One of them is in a REALLY inaccessible location from the inside.
Does anyone know of a blind bolt or anchoring system that:
1. Will be strong enough
2. Can be made watertight
3. Will not corrode?
I know - big ask.... Failing this I need to find a very small boat ferret.
I have not seen that type of bolts, but I read about a neat trick somewhere.
The idea is to make a backing plate with integrated attachment's.
The author used a thin line attached to a threaded hole in the center of the plate and a extra hole in the boat to pull it into place.
When in place a countersunk screw where used to keep the backing plate in place during installation (and left there).
There are several ways you could do this, using the outside plate as template.
I have successfully glued large washers and nuts onto plywood with thickened epoxy, use bolts to keep the washer & nut in place and build up a large cone of epoxy around the nut/washer apply some grease to the bolt threads to avoid it getting stuck (or avoid putting epoxy over the threads
You can also attache the bolts to the plate i a similar way.
If you prefer backing plate of metal you could weld the bolt / nut onto the plate or cut threads directly into the plate (you need some thickness in the plate to cut threads).