I was pleased with the ease of installation until I attempted to tighten the upper swivel base. The set screw head stripped out and could not be loosened. I eventually discovered that by loosening the slotted screw that I could get the set screw out. Now I have to go to the trouble and incovenience of finding a replacement set screw. So far I have not been able to locate such screw.
The various sized 22 tube type Uncle Mike swivels are a simple way to attach the rifle sling to the ram-rod bands of my flintlock & percussion muskets. They also fit the wire frame AK's.