Pic of the 'Lumps' finally worked to fit the action, width wise. It's mounted in the mostly stripped action. Stripping the action proved to be a daunting task! You will note in the pic that the hinge pin is covered with a cap screw on each side. The AyA pin drives from 'left to right'.....ask me how I learned that! The pin is staked in place. Best to research your action carefully before tackling this step. The screws are all engraved in this action, built in the sixties. I had to grind drivers....turnscrews if you wish... to fit each of the screws. The cap screws were the most difficult to get out....without ruining the slots and engraving. I'm still hesitant to start cutting bites and hinge lug 'til I'm positive what I'm doing. I've started by making a thin aluminum pattern to get the things lined up. A paper pattern is just too flimsy! The pin is just over an 11/32's bit,, ( I think it miked at 8.83mm). I wish to start with a hole rather than notching. My thinking right now is to use a drop of epoxy to hold the lumps and block in proper alignment until brazing. I've 'step drilled' the block out to 5/8's. I figure the barrels will measure at about 1"+, within the monoblock. My plan is for .458 bores, blanks are generally in the 1.20" range. I have the pattern, but have yet to grind the special tool to remove the tumblers from the action.