Paul from SWISCO responded:
February 10, 2015
For older wood sashes like this, I recommend our Series 500 spiral balance. This has a 5/8" diameter tube. I also recommend using it with our 17-012 bracket. This style has been used since the 40's by wood window manufacturers. You would simply screw the balance at the top of the window track screw the bracket on the bottom of the sash. To charge the balance, you can either use our 75-004 or 75-005.
I have a little trick I like to use to determine balance length for this kind of window. Measure the height of the glass and add 3" for the bottom sash or 1" for the top sash. |
Paul from SWISCO responded:
February 12, 2015
I have replaced the balance you show with our Series 500 in the past without having to cut or rout out the groove. As for length, yes I would round up to the next whole number. Based on your measurements, I would recommend 22" for the top sash and 24" for the bottom sash. I have not found it necessary to route out the bottom of the sash for the 17-012 bracket. I used a flat head screw to install it.
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