I purchased a small 5/16 geometric die head recently because I had to make a fairly large quantity of screws for a clock project I'm finishing. It really worked well and I'm very pleased with the results. I have a question about the chasers that fit into the head. I purchased a few sets on ebay and noticed that they have different letter markings preceding the placement number on the chaser. These prefixes have the letters A1, J1, L1, W1, Y1 and U1. They precede the numbers 1,2,3,4 on the chaser sets. I'm also not sure how the chamfer and face grind affect their use. Can anyone help me with this? Thanks, Bill S
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