Paul from SWISCO responded:
May 10, 2016
It looks like your old balance is much larger than the S900-12. The key measurement when determining length is the size of the outer tube, not the inside spring. If you have an undamaged version of this balance, I would use that as reference. I would suspect the diameter is thicker at 9/16", as well, which would make our Series 600 a closer match. You will need to confirm the length of the other tube to find the proper match.
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