The maximum screw size for projector mounting is 5mm (M5). The Optoma UHD65 (and possibly the UHD60) have M6 mounting screws, therefore it is not possible to mount the projector to this bracket with the supplied hollow set screws. It comes with (and accepts) 2.6mm, 3mm, 4mm, and 5mm mounting screws. The 6mm M6 bolt does not go through the set screws. Using washers and washers instead of the included set screws worked for me on this mount, although adjustment was a bit more difficult than if I could use the supplied (too small) hollow set screws.
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