Has anyone heard of the newer steel spacers wearing? I heard the older ones did, which is why HPI switched. However, that is a plausible explanation. Please keep us posted...wdhen was the last time you maintained your clutch prior to this happening? Please don't take this wrong, but sometimes guys don't look at their clutch for a gallon or so and bad things happen. I keep stealing my neighbor's Savage to maintain it for him....the first time his clutch bearings were shot. I mean they were GONE. This recent time, his shaft screw came loose. I told him to thread lock it (I did not want to be liable for it0. He didn't and it was 60% out. It would have been quasi-dangerous to run like that as that bell would have flown off.
Just go through everything piece by piece, you'll be able to tell what gave.