Paul from SWISCO responded:
February 7, 2017
Please see our Series 190 coil balance, I think this may be what you need. You will need the stamp on the old spring to determine the best option.
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Paul from SWISCO responded:
February 8, 2017
It is usually right near the screw hole. There shouldn't be any reason to unwind it or anything. It should be in open view.
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