I tried to do a search but I didn't really come up with anything concrete. The instructional video on the Crank Bros. website showed a version of the pedal with a rubber end cap, but my pedals have what looks like threaded caps with slot in them. I assumed that you could just spin it off in the same old lefty-loosey fashion, but they aren't coming off for me. Am I doing something wrong? I just want to put some grease in them...