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Message: <blockquote data-quote="Chris 8603" data-source="post: 128736" data-attributes="member: 23605"><p>I don't know how those are supposed to be on those. I have something similar on a water pump. One of my couplers has a stop ridge in it so it can only slide so far. The other has 2 set screws on the pump side since it bolts solid and has no way to move any. I would suggest drilling and tapping for set screws on the pump side to keep it from moving. Just  my opinion</p></blockquote><p></p>