Richard silly question but what do you use to drill out the hole in the aircraft to receive the Perspex rod?
Sorry it took so long to reply. Easiest way to explain is with a picture:
Got this idea from a Guilder - Rutger - a few years back. I drill a hole into the aircraft, typically with a small pin vice drill (as I don't own a larger one) and then stick in my standard hobby knife an spin the blade around making the whole larger and larger until it can fit the cut down masonry plug - or whatever it is - that I have previously cut down. I think the plug is 8mm on the inside and I got an 8mm perspex rod to fit. Sometimes in need to sand down the perspex a little to be sure of a snug fit.
Seems to work well - and I don't need magnets or anything like that.