I made this seating tool to use with my Marksman 2004 (same as Beeman P17). Seating depth is adjustable, and the domed end smooths out dings and flares pellet skirts. It is made from brass thumb nuts, a domed cap nut, and a 8-32 screw. All the cutting and turning was done by spinning the parts in a drill while grinding on them with a Dremel. The handle is from a bicycle brake lever extension.