I'm wanting to modify my Baikal double by cutting the extractor in half so that just the bottom section of the extractor engages the shotgun shell rims. So. I have two questions for those knowledgeable about this modification, please.   1. At what point between top and bottom of the extractor do you cut? In other words, how much extractor should be left in order to extract the shells cleanly?   2. What substance do you use to retain the top half of the extractor in the barrels?   I've se