Like Mike said, there is a wire in the groove, it looks like an o-ring at first glance. There are the two plugs on the front, and one on the outside of the housing. (Mine was packed with dirt, so I missed it the first time around.) Mine was a TB 25 but the video should give you an idea. On the down side, it sounds like if its been greased, you are already in trouble. With mine I was able to file everything up and get
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