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+1 vote on pre engagement, but I think the failure was due to the piston not being to glide freely along the rails and getting stuck.
Did you ever check if the piston was able to move freely?
You do so by assembling the piston with the piston head, but remove the piston head o-ring. Reassemble the mechbox with only the compression parts. Screw both halves together with a few screws. Shake the mechbox up and down. Does the piston move? If not you need to sand down the guide rails.
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