I have the Dixie Gun Works worm and it is very good quality. Definitely turn down the end of the dowel (I just spun the end on a metal grinding wheel for a while). At first I had trouble with it being secured, then I epoxied it in, drilled a hole in the side, and screwed in a round headed wood screw for shear strength when twisting. It hasn't budged in years. Perfect size for 2.25 bore. 2.25 worm might stick or scratch.