My other hobby is building a race car, I'm lucky to have a welder, drill press and metal band saw.
Its simply a piece of 1/8 steel plate cut to a 3x3.5 size.
I drill a 1/2 hole and weld a grade nut to the plate. I then drill two small holes in opposite corners so that I can put two screws to the base of the stand.
Cheers
Fred