||(2) lengths of 2x4 for
skids, a couple of bits of 1/2" plywood, about 45 golf balls, plastic
shim/bearing and plastic pipe bushing, plus a 1/2" Ststl bolt with Nyloc nut
to hold it all together. Tightening the nut will create friction on the
bearing which will slow the rotation (if you have ever tried to demonstrate
a move on an un-braked simulator, you will know to appreciate this feature).
A bit of EVA padding protects the board, and a pair of
rack straps will secure it.
Simple and cheap! (actually, at about $1.- a pop,
those golf balls are pretty dear)