Tom from SWISCO responded:
March 29, 2017
A stamp of 27 3 usually corresponds to our 2730 option, but you may want to weigh your sash just to be sure. There's a chart on the S350-28 store page that tells you how much weight each option is meant to support. Either way, it definitely sounds like you need new balances. Figure that this kind of hardware has a lifespan of 5-10 years, depending on how often they're used.
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Tom from SWISCO responded:
March 30, 2017
If it is exactly 19 pounds, without leaning one way or the other, it would ultimately come down to personal preference. I'd probably stick with the 2730 option, since that's what you had before.
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