Power bolt nozzle in Tanaka Gas Rifles Posted June 25, 2012 · Report reply Not sooo easy. But I drill it and then place the nozzle from the VSR kit into the bolt. To make sure that it's on the right spot I glue it into the bolt and let it in the weapon to dry. So the nozzle is in the exact right position to the chamber. After that I shorten it to the exact right length, by measuring the distance from the entry of the chamber to the HopUp itself. Considering that the BB has to fit exactly between the Nozzle and HopUp.