I purchased a Fulghum rest for 1000 yd BR about a month ago and have used it in 4 matches. I have it set up so the rest top DOES NOT PIVOT, it's in a locked position. I find when I shoot 40 rounds with my 6x47, continually pushing against the front stops, the top ALWAYS seems to work loose. The two small front brass screws that butt against the rest top don't seem to be doing their job of keeping the top rigid. Has anyone else using this rest experienced the same problem? Love the simplicity of the windage and elevation setup but the loose top is growing old.