Yes, they are. Anytime I buy things like this I sand the screw ends and things like that just to make sure that it doesn’t become a problem. So I didn’t have the loosening problems that others have had.
But I received my Chisel Attachment several days ago. When I started sharpening a chisel, I would sometimes hit the lower stone stop pretty good and jar the L-Bracket. I noticed that the L-Bracket screw was loosening up on me. So after I locked the screw back down, I also locked down the L-Screw that came with the SS micro-adjusters. The L-Screw stayed tight and the L-Bracket didn’t move even though I bumped it a bunch of times.