“What you see in the pic above and below is 1″ galvanized floor flanges. I tapped a hole into the lip of each flange so I could insert a screw to tighten to the griddle stand legs. The deep fryer legs were bigger so that took 1 1/4 inch flanges.”
 
Excellent Idea and execution, and you have now answered one of the most often asked questions on the Pro RF site. Great job.
jack