Started 'nibbling' away at the lumps, cut and fit, cut..... It seems to me the equally important step is to ensure the locking bolt is fitting well. As well as the rotation into the body. I took the locking bolt, now that the action is stripped, and tried the bolt on the shotgun barrels. Frankly, I was amazed at how much 'slop'.....clearance if you wish.....there was between the barrels and the bolt. And yet, this AyA locks up tight! You can see the block and lumps starting to come together. I feel fairly well convinced that the 2 piece block is the way to go if one doesn't have a real milling machine! The lumps are still a snug fit into the frame but, I dare not do any sanding/stoning 'til the pieces are brazed. In the pic you can see the 'dollshead is starting to enter the action.