Charles,
I did it years ago. After many attempts to build a suitable device, I gave up. Also, the acrylic tends to shatter after machining (like days/weeks later) and it was a real pain in the ass to go make another device. I have a few laying on top of my computer cart at work if you wanted to try it, but, wow, that was not very fun. Of course, the ones that didn't crack up didn't work well either. Murphy's law. I applaud Harold's patience in building the device. I have the acrylic rod left too if you want some. Send an address.