Just wanted to say thanks all because I was having difficulty finding a mount that would work with my RS40. I must say I can't imagine any mount being better given the simple, easy mounting method and easy and simple ability to adjust and square to the screen, fantastic! IMHO this is the best option:
Precision Gear Universal Projector Mount
The funny thing is I called Peerless and they told me this mount wouldn't work. Just check the specs of the mount, it has the reach. They are wrong, it works without any flipping, fabrication, etc, right out of the box. I found this info in this thread, thks for whomever that was
Peerless suggested I get the custom model, but that one is not universal... it will only fit the JVC. I suppose you could drill some holes and make it work for other projectors.
Both the custom and universal mount are rated at 50lbs.
If your intent is to mount this directly to the ceiling/flush all you need to do is buy this mount. If you need a drop down tube you can buy a 1 1/2 standard threaded steel pipe or PVC. I used PVC with threaded 1 1/2 end and it works fine, spray it black. If mine falls to the ground I'll let you know. It's only holding 33-38 lbs. I hung from it at 200 lbs and it held me, yeah I need to loose some weight. Okay, with a drop down tube you'll need something to attach the tube to the ceiling...
Before I bought this mount I had a welder weld some extension arms together on my old universal mount ($20). It looked good and worked, but... The mount was rated at 35lbs and I worried that it wouldn't hold and the projector kept drifting, it wouldn't say square. After a few days I decided to buy an new mount.
Hope this helps.. thanks all