I've just put together a "longhorn" mod & installed it on my Grado Black with nice results! The top end is much smoother,and the bass is better defined. I used 1/8 square brass tubing, filled with a soft lead filled product that us used for fly fishing! It's about 1 & 1/2 inches long & mounted to the lower front of the cartridge body. I have it temporarily mounted using something like blu-tac. Has anyone tried this with other cartridge brands?