I have a few ceiling registers which are not flush with the ceiling since the duct has loosened over time. What's the best way to get them flush with the ceiling? I thought about driving several sheet metal screws into them but they would go into drywall which has only so much holding strength. Is there a better method? Thanks
I found some more registers that the previous homeowner completed stripped the screws on. I put a glob of JB weld on the problematic hole, completely covering it. Came back the next day and drilled a small hole through it and carefully screwed in the register. I was skeptical but it held very well and tight! On another register I drilled another hole into the sheet metal to solve the same problem. BTW, I highly recommend a socket and not screwdriver for removing/tightning.
I had this problem as well, I installed a couple of 'leaf springs' on a plastic register and it stays in place very well. Here's a link to a video I made for it.
The Wright Handyman