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Originally Posted by DavidK442 
If you have the space I would be more inclined to build a small 3 sided plywood box with the bottom hanging down to roughly the correct height. Tack each side gently into the joist with a couple screws, mount the project and test. Back the screws out and readjust the box position until either the height is bang on or just slightly high. Use large washers between the mount and the box to nudge the projector down and balance horizontaly if needed.
I would make the box large enough so that the sides stradle the floor joists to make it easier to access the screws.

If you have the space I would be more inclined to build a small 3 sided plywood box with the bottom hanging down to roughly the correct height. Tack each side gently into the joist with a couple screws, mount the project and test. Back the screws out and readjust the box position until either the height is bang on or just slightly high. Use large washers between the mount and the box to nudge the projector down and balance horizontaly if needed.
I would make the box large enough so that the sides stradle the floor joists to make it easier to access the screws.
I've thought about making a box, but decided against it for a few reasons, the biggest one being that even the thinnest of plywood would result in the projector height lowering by 1/2", and I need all the room I can get.
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This is an excellent thought... After thinking some more, I am going to attach a big washer and nut right under the 2x4 block to better secure at the top; then add a washer and nut above the projector mount as well as below it to clamp as you describe. So total of 3 washers and nuts on each screw. The top nut clamps to the block and the bottom 2 clamp the projector. Thanks for the suggestion!
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Don't mind at all, thanks for your input - it is much appreciated!












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