Retrofitting old double hung windows that have sash weights.

A quick learner from Coastal Maine says:
We are retrofitting a number of old double hung windows, wanting to remove the pig iron weights, rope, and insulate the window pockets and install a new type balance.

Which type to you recommend? The overall window size is 32" x 57", so each sash is just over half that for height.

I have a complete wood shop, and routing slots or grooves or manufacturing new pieces of parting beads, etc., is not problem.

Also, these windows have almost no weatherstripping. What is best for retrofitting?

Thank you,
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Paul from SWISCO responded:
Since these are old wood windows, I think you should consider our Series 500 non tilt balance along with a 17-012 bottom balance bracket. To figure out the balance length, get the height of the visible glass, then add one inch if it's the top sash or three inches if it's the bottom sash. That'll be the length you want.

We also carry the 58-053 kerf mounted bubble seal, which many wood window manufacturers have used on the bottom sash to press against the sill.
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