Beartracks and HOH Thanks! The anti rotation triangle was created by turning a shoulder on the piece the right depth and diameter to contain the feature. Then I used some machinist blue layout dye and marked the location of the triangle sides with some scribe lines. Then I used use a small hacksaw and files to remove the excess material. I make some "safe" files up by grinding the teeth off one of the edges so you can better control where you want to remove material from the workpiece. It helps to have the band there to continually check the progress. Once the nub will slip into the band you're done! All this makes me really appreciate what the earlly gunmakers accomplished all by hand! Salt Flat