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Paul from SWISCO responded:
September 13, 2010
The different options represent different strengths of the balance spring. Sometimes the numbers are very faint on the balance, look closely again to see if you see any markings. Sometimes the stamp will not exactly be one of our options. If that is the case, respond back here with the stamp you do find. If there is no markings on your original balance we can still figure out what option you need by going by the weight of the window sash. To weigh your window sash, remove it from the window frame and weigh it on a simple scale like a bathroom scale. See this guide on how to remove the sash from the window frame. |
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Casey from SWISCO responded:
September 14, 2010
Stamp option 1810 would be the lightest strength balance for Series 372.
S372-19 with stamp 1810 will carry a window sash weight range of 5 through 8 lbs. This information is based on 2 balances per sash. Suggested sash weights do not include the manufacturer's sash friction from use of weatherstripping. This friction should be verified by the manufacturer since all windows vary in sash friction due to manufacturing methods and weatherstrip types. |
