Truglo Magnum Gobble Dot Issues??

[BDeal]

Has anyone else had issues with the rear sight? Once I tighten down the setscrew for the windage and then loosen it again for an adjustment, the rear sight will not fasten down where I need it to. It's like there is a small indent from the setscrew and it will only go back to that original  position where I tightened it down. Extremely frustrating. Have others experienced this as well?

Thanks!