I'm afraid that spring is not sold separately. If that has broken then you will need an all new lock.
The bad news is that I don't believe the lock itself is even made anymore. Before I say anything for sure, can you show me a full picture of the lock in undamaged condition? That would give me a better idea of what you have and whether we have an alternative you could try.
Sounds good, I'll be here whenever you can get that for me.
Just understand now that I'm not 100% optimistic that we will have a good replacement for this. If you have the lock I think you do, then it's a discontinued part that we can't supply. I'd still be happy to look into it, I just don't want to get your hopes up!
Thank you. This is an older style Pella lock that has not been made in many years, to my knowledge. I have had a few customers in the past tell me that they were able to get our 90-213 to work, which is a more modern version, but I've had others tell me that it's not compatible. I've never tried it myself so I can't say for sure, but I would wager that if this lock can work, it would require a bit of handiwork to fit in the window.
Personally, I'm not optimistic. Pella parts are very, very specific. They intentionally design their hardware so that you can't use alternatives. However, the 90-213 is our best and only option available. You are welcome to try it out if you think you can get it to fit in your window. Just understand that it's not a guarantee.