Pete, the one BWT gage I made, I used brass and cone shaped the top like yours. I also used a thumb screw to hold it secure to the rod.
I can do both 10 and 12 gage on the one cone.

Let me know what the diameter of your rod is and I can make you one. I have some brass on hand, just pay for the shipping.

This is what the cones on mine look like.

Last edited by JDW; 03/24/14 03:03 PM.

David