The sercet to not stripping the screws out on the Lee Auto Disk powder measure is "do not remove the hopper" when changing disk. For liabilty reasons I am not going to explain it to you. Years ago Lee had the directions in their manual for the disk measure. Just look at the measure and you will figure it out. I have never taken the hopper off. The other answer is to buy the update kit that changes over to the quick change hopper and you get a adjustable charge bar to replace the disk.