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Pretty simple. The stroke is longer than the slide out travels. IMO, it would be hard to build every slide unit exactly with exactly the same travel. Thus, the long travel cylinder, and leave the space in between the nuts. Inner nut sets outer travel limits; outer nuts set inner travel limits. You just want it to crush the rubber seals both ways. IIRC, the cylinder is 2" diameter and the pump is somewhere around 2300 PSI. I'm thinking that would be somewhat over 3000 lbs. of force the cylinder would exert on the out stroke; somewhat less on the in stroke. Enough to do some serious damage. JMHO
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