Lee,
I use an 8" length of 3/4" dowel (for 12 ga.). Drill a 1/8" hole about 1 1/2" from the end and tap in an Xacto blade at approximately a 45 degree angle with the sharp edge towards the end of the dowel that the hull will slip over. (I use the convex curved style blade.) Drill a hole in the end of the dowel and fit a round head screw to adjust for the desired hull length. I tapered the end of mine a bit to allow the hull to slip on easier. Slide the hull on an twist until you reach the desired length. Inexpensive, simple and works like a charm. I wish I could claim to have invented it but I found it either here or another website.
Phil
