Advice / pointers on replacing valve seal

dadsbee said
Easiest, least fuss. Just stick a rope in and turn the crank to bring it and the piston up against the valve heads, re and re the spring and seal, turn crank backwards a tad and pull out the rope.
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Wow, thanks so much for posting pictures. That definitely seems much easier than using the air method. My only fear is not having the cylinder high enough or enough rope fed in & the valve just dropping