Well, after much thought, here is my first add-on that is compatible with all of my Lucifers Ladder and Stairway To Heaven electrodes, the Dorsal Trigger Electrode.

It's designed to attach to the front end of any size of those two electrodes and is held in place by the front loop of conductive rubber. You will need an extra 1"/25mm of penis space at the end of your LL or STH electrode in order to be able to fit it in place in the correct position.

It features a 28mm/1.1" strip on Omega Conductive Rubber that clips into a contoured recess on the underside. This rests the Omega Conductive Rubber directly over the dorsal nerve and is excellent for added pinpoint stimulation of that nerve. Just add some water-based electrogel to aid skin contact, and you are in for a wild ride.

Dorsal Trigger Electrode Recommendations

I suggest wiring it up and using the lower loop around both cock and balls to stimulate the dorsal and perineal nerve groups for added pleasure.