what size handhold you want to make, and cut off a peice of foam
about that size.
lines on your foam block to guide youself in cutting your foam
out the shape of your foam mold using a fine hand saw.
saw does a good job with cutting off the basic peices. Now
use a fine hand file to smooth and shape your foam mold.
finish off your custom foam mold to exactly the shape you want.
You can file in your own curves and edges for any feel or difficulty.
time to bore out a hole in your foam so that a bolt or screw
will be able to go through your final mold project. You will
need a couple different sized drill bits, and the bolts that
you're going to use to fasten your handholds to make sure they're
going to fit.
the drill bit and a little tube to guid it, drill out the hole
for your bolt. Then, using a larger drill bit, widen the top
part of the hole so that a bolt head and rachet socket will
be able to fit in there.
your foam mold is ready to be applied into the casting phase
of making your custom handhold!