I am hoping you guys can help shed some light on this issue for me. The left side frame slider (attached at the frame to cylinder head) is missing. I heard a strange noise yesterday....like something came off the bike, but until today did not notice that it was the frame slider. Some background...the bike has not been down so there are not external forces involved here and about a month ago I noticed it was loose and tightened back...not excessively. I checked both sides and only the left side was loose. I am worried that the bolt sheared off as what I see left in the frame hole doesn't apprear like I expect...no obvious allen key hole to tighten or remove. I've looked at the manual and did not find a picture of what it should look like. I will remove the right side for comparison tomorrow...