Daryl, you might be able to pick up a used Lincoln. They have adjustable spring tension for speed and you can adjust the angles.
I think new there are over $500 and a nice thing for a few guys to chip in and buy. The ones I have seen have an area to sit on and also be fastened to something solid.

http://www.lincolntraps.com/prices_manual.html

Last edited by JDW; 09/09/12 06:21 PM.

David