OK. It just dawned on me that I had the u-joint and yoke replaced several montha ago when I had a new clutch and pressure plate installed. The old u-joint was completely trashed and had worn out the yoke. Now I'm wondering if my mechanic didn't leave parts of the old trunion bearings in there somewhere. That could also account for the lock washer. Unless anyone can see something in the pics that I'm overlooking, I think that may be the root cause.
