The method I used to make a "lap" is to pour a bullet, let it set and swing the sprue plate but don't drop the bullet out. I then take a self tapping screw, hex head (either self drilling or just self tapping will work) and center it on the base in my cordless drill (I use hex head screws and a 1/4" nut driver w/magnet) Drive the screw about half way down the bullet, you'll have to hold the mold tight to keep the bullet from spinning. There's your "lap". Takes longer to write about it than do it. I use a Comet or toothpaste first and check. If the mold needs more, I then use 600 grit compound. I've done three molds like this, two aluminum and one steel. Works for me...
My Anchor is holding fast!
Last edited by mikld; March 23, 2011 at 11:44 AM.