I had to find an inexpensive way to keep up with all my dust control accessories. I usually have to use my power wheelchair to get around. I did have lots of scrap though. So I measured and rounded pieces off to about a 2 inch tall knob to fit just inside of the accessories. I drilled a screw in the center and mounted the round knob to a 2×4. Then I mounted a couple of hinges i had lying around to it. I also used masking tape, sharp pointed permanent marker and gave each knob a number that corresponds to a number on the accessory. Works great! Cost: $0.00.