Hard to tighten - BKL Technologies 0.6in Long Dovetail Rings, Series 200

Have 11mm dovetail. These look well made but they are really hard to tighten. The hex head screws weren't best quality and hard to get the wrench into. Also when you slide the ring onto the dovetail, it's hard to hold the ring in place and tighten because it takes a lot of effort to tighten. Not impossible, but just annoying. Ended up needing higher mounts so going to try a different brand with the two piece clamping.