27 9 dp Caldwell window channel

Question

I'm am trying to narrow down what parts I need. I have a 28" Caldwell channel. I am pretty sure I need your 350 channel as a replacement but I'm not sure about the sash weight. How can I determine which weight I need?

Tom · Accepted Answer

Thanks for posting. Regarding your 27 9 stamp, stamps ending in "9" or "90" are based on an old rating system that has fallen out of use. The only other way to know which spring strength you need is to weigh your sash. Please let us know, and we can make a suggestion for you.