I have screwed corner protectors on a ceiling box to fix a craftsman error. Unfortunately, the base structure itself is wavy and everything looks crooked, including the corner protectors. I initially thought of trying to press the corner protectors as much as possible against the drywall to get a tight and smooth corner, but now I'm considering unscrewing everything and starting from scratch. Instead, using a laser level to get the corner protector horizontal, even if the box itself isn't, that is, utilizing the corner protector's "straightness" to make the box edge straighter. Am I thinking correctly now?
 
It's not great to screw the corner brackets, as they tend to become crooked. Use the right tool to fasten them instead.
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Thank you, I also got that tip but unfortunately, I don't want to invest in another tool just for a corner protector. Moreover, I'm a bit unsure if it will work since I have an old corner protector in the plaster layer underneath. I have thus needed to build onto an existing structure.

By crooked, I don't mean that the protector bends where I've screwed, but that the entire line of about 4 meters undulates slightly since the structure itself is a bit warped. I was wondering if it could be possible to mount the corner protector in such a way that the entire edge of the structure appears a bit straighter? This would result in the corner protector not lying flush against the plaster at all points but having a bit of space to make the structure appear straight.

Apologies for the long explanation, but I can't express myself in technical terms! ;)
 
In principle, it should work to attach the corner guard after the laser, and then I would gypsum plaster out to the right level. It doesn't work with spackle if it's 5mm for example.
 
ok thanks, I'll try that!
 
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