The coiled balance springs on the upper sash of one of my
CertainTeed windows needs to be replaced. The number stamped
on the spring is 335.
However, following the formula in your
DIY guide, "Choose the Appropriate Coil Balance", the result
calls for a 6 lb. spring (336 coil balance spring).
Which
one should I use?
Paul from SWISCO responded:
April 4, 2012
Thanks for posting! We always recommend that you order the original spring number the window manufacturer used, unless the spring was too weak to hold up the window sash.