our bolt vise helps you disassemble your AR-15 bolt without fuss. The screw assembly face fits perfectly into the bolt face to compress the ejector so you can remove the spring pin easily. Once the screw is flat against the bolt face, drive out the roll pin with a 1/16″ punch. Once the pin is removed you slowly back off the screw assembly and remove the ejector and spring for cleaning, maintenance, or checking headspace. When doing this kind of work you should always try to replace the ejector spring pin when reassembling. It is good practice to keep your bolt functioning properly.