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Try this solution...
Couple a piece of threaded rod parallel with the rod of the cylinder attached to the same component as the rod end, but free on the other (cylinder) end. You can then make a stroke limiter that can either stop the cylinder at a fixed ( albeit adjustable by using a nut and a jam nut on the threaded rod ) stroke, or by using a gate mechanism actuated by one of the small servos you could turn the stroke limiter (gate) on to stop it at one distance or off to allow full stroke operation of the cylinder. Adding more "gates " would give you the possibility of having a few stroke lengths. Hope this helps you out , or at least opens another door for you.
Good luck
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