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Tom from SWISCO responded:
October 20, 2014
Hey, thanks for posting. I'm glad you like our site! I've narrowed this down to two possible channel balance Series: either our Series 351 or our Series 390.
Now, as you can see, the only difference between these two Series is their bottom shoe. The Series 351 uses the 15-002 while the Series 390 uses the 15-001. I can't quite tell what you have based on your pictures, though. Please carefully compare their dimensions to your own hardware and see which is a better match. 
Comparison of 15-001 & 15-002
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Paul from SWISCO responded:
October 22, 2014
Glad we were able to help. I'll address your questions one at a time.
1) There could be a lot of reasons why a balance makes noise when the window opens and closes, but the most common source is a certain type of hook used by some manufacturers. This hook is designed in such a way that it causes the knot in the string to rub against the spring as it operates. Eventually, the knot will fray and the string will snap, and this could actually cause damage to your window. Fortunately, the balances we supply have a bent hook that relieves pressure on the knot and prevents the excess friction. If you have other windows in the house with this kind of hook and you don't plan on replacing the balances, then there is a quick solution. You could drill a small relief hole in the jamb itself to "cradle" the knot. 2) Nylon balance attachments with wings are specifically meant to stabilize the balance in certain jamb tracks. Since your balances dodn't have wings, I see no problem just sticking with that. |
