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I don't think it matters how much play it has when it's expanding...as long as it's not leaking too much between the rod and the piston head.
When it's collapsed...it's pretty ridgid, and supported by the cylinder. When it's expanding to push the bolt back, it doesn't matter how stiff it is. Some slop is probably a good thing actually.
Neat idea though...go for it!
Tys
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