Thanks, Ron. That is why I asked. Those long necks cause real problems in holding the horn while you work on them.
The only Better Idea I have seen is a version of a leatherman's "Harness" vise, where a leather strap is attached to the bottom of one jaw, and it is wrapped into a loop OVER the horn, then through a slot in the other jaw, leading to a loop in which you put your foot. A padded U-notch is at the bottom of the jaws, to support the horn from the bottom. Leather tabs extend from the padding on the notch up over the slot where the strap goes through the second jaw, and where the strap is attached to the first jaw, insuring a 360 degree contact of leather padding around the horn, regardless of diameter.
Tension put on the loop puts tension on the loop holding the horn. Lifting your foot allows the horn to be quickly and easily be turned. The leather strap is damped with water prior to use, to give it better hold on the horn.
I haven't made one of these, but its on my mind if and when I get around to working on a couple of horns. First I have to build a press to flatten some of the smaller horns..... :grin: