Need help with getting part(s) (and instructions on removal)
Hello,
It's hard to tell exactly what lock you have while it's still installed, but it reminds me strongly of our 90-294. I think this may be what you have but you'll have to look it over and see how well it compares.
As for the coil balances, take a look and compare the specifications of the 15-177 pivot shoe to yours removed from the window. If it's a match, see the S152 coil springs used with this assembly. We've also related the bushing, cap, and barrel on this page that support the coils.
As for the strength options, if there are no numbers on your original springs you'll need to weigh the window sash and divide the weight by the number of coils used on both sides. In the meantime, see the videos related on this page to help you through the replacement process. Thank you!
We did carry a thicker version of the 15-177 pivot shoe at one time, but unfortunately, it has been discontinued. We do have a possible solution but it would involve replacing the original coil balance hardware and pivot bars with the parts shown in the video below. Take a look at the conversion process and specifications shown on our product pages to see if this could work for your window. We haven't had the opportunity to test these parts in a window that uses your original hardware but it would be our best option at this time. Note that you'll still need to weigh the sash the choose the strength options for the new coil springs. If needed you're welcome to review our return policy here for the 15-177 shoes you already purchased.