The register in my bathroom has been painted over a 1000 times it seems and no matter how hard I try I cannot get the vents to move. I’m not much of an AC person to begin with since I love to have windows open (but the heat downstate makes that impossible in the summer) but I really don’t like ice cold air blowing on my toes when I’m using the bathroom.
To fix the issue I simply bought a pack of magnetic vent covers from Home Depot for less than $5 for three. I cut a notch at the top so that the vent lever would fit and voila – problem solved.
Of course I could try to remove the old register and buy a new one but did you read, it has a thousand layers of paint on it and the screws that hold it into place. I think the next owners of the house can deal with that issue.