I had one in for repair 4 or 5 years ago. I sold him a rebuilt , that I had just done. The bearings were both functional on the broken one. The leverage against that part of a pedal is most upon impact-----moreso on larger drums with the beater extended. The guy was a professional session drummer, totally loved speed kings and played very hard-----his pedal was pretty well worn by the time I got to it. I rebuild/sell/clean/adjust microscopes off and on as well, so I put the broken surfaces under a 30x stereo-mic. and the casting was very structurally weak at that point. The crystals were very large ,coarse and malformed. It was clearly a lousy casting . It looked to me like the break had occurred in stages. There was a small amount of oxidation where an unnoticed hairline crack had taken place sometime ago and then perhaps the pedal got loose and went askew , causing a twisting effect against an already weak point.