It also has the advantage that you can remove and reinsert the bolt repeatedly since the tube part doesn't fall behind the wall like the single use wing nut style. However, the hole must match the fastener diameter if the hole is oversize it can't be properly set. This wall filler is the only heavy weight compound that ensures a perfect match to drywall, plaster repair, and wood. Works great for repairing holes in drywall, wall plaster, and wood. An alternative molly bolt that does not have this problem is a hollow drive molly bolt that does not have a separate nut but consists of a tubular shaft that compresses behind the wall when the bolt is screwed in the shaft fills the hole so there is no wiggling around of the bolt. Fills holes and cracks in walls fast with a quick use applicator so you can update your house or apartment in a flash and get your deposit back from your landlord. Over time this can allow something that is used frequently (like a TP holder) to move around a bit and sometimes the bolt loosens. The hole in the medallion should be greater than the diameter of the ceiling box (typically, 3-12 or 4 inches) but less than the diameter of the. Measure the diameter of the ceiling light canopy. The fastener you are talking about - a molly bolt with a wing nut - is not as good in my opinion as the nut makes a hole much bigger in diameter than the bolt itself. For ceiling medallions without pre-cut center holes, cut a hole in the medallion with a hole saw or jig saw to accommodate the ceiling light wiring. A single, typical threaded insert has a pullout strength of at least 80 pounds, so they are entirely adequate for this job as long as the size is properly matched to the hole.
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