Bob from SWISCO responded:
February 11, 2021
Hello there. If you're certain all the outer tube diameters are 5/8", then these are Series 600 Spiral Balances. Sometimes with the flimsier old plastic tubes though, the diameter can be tricky to measure, so please double-check to be certain. For instance, there is no yellow tip for the S600-17; but there is for the S900-17. So confirm all these diameters. Get back to me with those diameters and we can go from there. |
Tom from SWISCO responded:
February 12, 2021
I agree, that looks like our Series 600 alright. As for tip color, that was definitely once white. White was an older tip color that was way more popular than it is now. These days the Red tip is what companies use instead, but you may want to weigh your sash on a scale to be sure that's right. |