One of my sharpening levers has come loose so that it sometimes falls down when I play that string sharp. I thought if I just tightened the screw between the lever and the mount that it would fix it, but I couldn’t get a screwdriver at that angle. So I unscrewed the entire thing off of the wooden frame only to realize that the screw connecting the lever to the mount was fixed in place and I couldn’t tighten it that way. I’ve it back on now but it’s still too loose. Does anyone have any ideas what I could do to make work properly?