Thanks gentlemen, I just tried my hand using some modeling clay, ramrod , matchsticks and duct tape. Unfortunately a small hole allowed some liquid to escape down the stock, resulting in a less than full pour; the hole sealed itself, so I continued with the pour, but it separated in a cold joint. I have now taken the entire pour off, and am considering a second pour or making a sheet metal end cap. Quite a frustrating experience, but that's how we learn. Geo.