This is not a How To -- but I spent a bunch of time making molds in that well.

You could say the well itself is the mold, and if you are handy with epoxy anf

fiberglass you can use it to make your plug. I'd plan to line the surface of the

well with, maybe, 1/16" cardboard or 1/8". Then coat it with too much wax.

Hang your strips of cloth fron the top flat (don't worry about the attactment

places yet, you'll scroll them out with a jigsaw) You will also have closed the

bottom off with a piece of waxed doorskin to glass over and create the bottom.

ETC good luick.