going a little more complicated,
drill a 4mm hole in a piece of wood
put a spring on the piece of wood with the hole dead centre
put a shock shaft with its bottom still on it on the top of the spring
attach some fishing line to the end where the piston would normally be i reckon leave on circlip on for this attach the other end to a fishing sprung scale basically under the piece of wood
pull down on the scale to a fixed load, measure the compression
or pull down to compress spring to a fixed compression and read off the mass from the scales
does this make sense to anyone but me??
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