Chris, Try some "Floor Gripper Pad." http://www.homedepot.com/p/TrafficMASTER-Premium-2-ft-x-4-ft-Non-Sl...
Keeps throw rugs from skidding on wooden floors. It is very inexpensive and works really really well. I place a small square of it on my lap when I play my gourd. I guess one could even attach some of it to the back of a gourd . . . something non invasive and reversible . . . double stick tape maybe? Kid's Rubber Cement?
Chris .....what is HD?
Seems as though almost anything will do. But, how best to hook it up?
Ah, thanks for breaking the code.