UPVC sash window coil balances

A handy person from London, United Kingdom says:
Hello Swisco Expert!

I need to replace a sash window coil balances pair. Please see attached photos, which include measurements. Additional info:

- The shoe is stamped 550 Pat.#5,704,165
- Coil springs are 1/2" wide. The coil closer to the shoe is stamped with the number 8. The coil further away from the shoe is stamped with the number 9 (I think - or could be a 6?)
- The weight of the window panel is 30 lb

I would be interested in purchasing two pairs of replacement coil springs, maybe additionally a replacement set to have another option available for the job, or to keep as an extra spare part (I have other windows of similar or larger size in the house).

Thank you in advance,
Paolo
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Paul from SWISCO responded:

Hello,

We checked the mold and patent number and it appears that your pivot shoe is no longer being made. We suggest our 15-199 pivot shoe as a replacement. The coil springs aren't screwed on but hook together. The top coil spring would hook into the lower coil spring cut out hole and the bottom spring would hook into the top hole of the pivot shoe. The Series 160-6 actually supports 6.5 pounds and the S160-7 supports 7.5 pounds that would be equal to your old springs. You can either reuse your old coil spring housing or use the new style 15-150D.

A handy person from London, United Kingdom says:
Thank you very much. I have just ordered the spares with the suggested solution and I'll let you know how it goes.
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