Multiboard Threaded Keyboard Holder

Just a remix of FredvomJupiet's Keyboard Holder for the Multiboard. Their model uses a Multiboard plug style connector, and it works fine for most lightweight keyboards. I have several keyboards, and thought it was a beautifully designed piece of work. Some of my keyboards have aluminum shells, though, and are around 4+ pounds. I'm not confident in the plug in style connector to handle that weight. I modified their work a bit to have holes spaced apart to fit medium threaded Multiboard t