Original 1940s Spiral Balance

Hi- thanks so much for posting! 

Based on your photos, I would recommend our Series 500 spiral balance and our 17-012 bracket. 

We've been using this combination of hardware for wood windows like this for the better part of a century so you should have no trouble. 

Get back to us if you have any questions. 

Thanks for getting back to us!

You may want to weigh your sash just to be 100%. I don't think you can even remove your sash for this kind of window, so if I were you I'd put a scale on the sill and gently lower the sash on top of it. It won't be 100% accurate, but it should give you a general idea of what you need.

Yes, 2-3 rotations should be perfect. If that's not enough, give it another 1-2 turns, but I wouldn't give it more than that.

You should be able to use your same screw. I don't know if you'll need a screw plug or not, these are generally used for a different kind of application. If your current screw hole is fine then don't worry about it.

Great, glad you were able to determine the color tip you need. As for the rotations, you should start feeling tension build after 2 to 3 turns. You will feel it get increasingly tighter with each revolution. 

Great! Feel free to update us on how it goes.

If your sash weight falls under both color tip options, then it doesn't matter that much which one you go with.  They should both do the job equally well. It would ultimately be up to you.

You're welcome! Thanks for coming to SWISCO.

I'll pass the word on to Steve. We'll be looking forward to your next DIY project, and anybody else you send our way is above and beyond. Thanks for the praise; we're glad to help.