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Default septic tank lid stuck

Pop wrote:

A 4' cable with 500 pounds of tension would move sideways about 1/2"
with a 20 pound force in the middle.


... is there some magic lay-formula to use?


With 400 pounds of cable tension and a sideways deflection distance d
and deflection angle a, 2x400sin(a) = 20 makes sin(a) = 0.025 = d/24,
approximately, for a 24" distance (half the cable length) so
d = 0.025x24 = 0.6".

Wouldn't it depend on the cable composition?


Not much.

Nick