The simple/cheap way, although you need to readjust it due to increased lengthening is to unscrew the stem, hold the part that contacts the bullet upright. Then take a candle and drip some wax into the seating hollow. While the wax is hot take a toothpick or some such and spread the wax out to the edge of the part that contacts the bullet. Put the die back together and screw it into the press but leave it a quarter inch from full contact. Load a cartridge and using repeated times of pushing the cartridge into the die, each time turning the die a little farther into the press until the desired OAL is reached. then adjust the split-ring on the die so that is the point where it is installed.