Ok, so I found one of the HoMedics ones (like Spooky Sam used, and many others, from what I can tell). Here's where I'm stuck -I removed the "egg-shaped" tips and now just have the rubber-sleeved heavy duty springs that stick up at an angle from the rotating discs. I'm using the bell-ended 1/2" PVC conduit that Spooky Sam recommended. It's a nice fit, but if I literally slip the bell over the stubs then the two pieces rotate in very wide circles. SS's pics of the mech itself aren't very clear. I guess I'm wondering if the PVC is supposed to slide all the way down the springs (so it pretty much sits on the rotating disc) or if I should be somehow trying to hold it above. And if it slides all the way down, then do I use the plumber's tape to hold it "straight"? I'd like to think I'm not a complete idiot, but for some reason this just isn't clicking for me.