Balance Lock

Thanks for posting! It appears you have a non-tilt spiral balance however, to confirm for sure I'll need a bit more information.

To start, I'll need to see a clearer photo of your the bottom tip of your balance, the length of the metal tube, and a photo of the bracket or clip that attaches to the bottom of the balance.

It also appears that there is not colored tip on the bottom of the metal tube, so I'll also need to know the exact weight of the sash.

Let me know if you have any questions.