STEP 2: Slide Collet Protector over "B" Collet and insert insulation pin for alignment. This will ensure alignment after set screws have been tightened. Locate the two set screws that are lower than the other two. These will be the only screws you tighten. Place one of these screws in between the two set screws on the gun shaft. Tighten screws snug. Do not over tighten.