Windows Don't open with newly installed S140

Thanks for reaching out to us. I'm sorry to hear you're having trouble with this balance, but I think I know the problem.

Though his balance system looks like our Series 140, its design is just different enough that our part is not compatible. This is due to the fact that they are made by different manufacturers. Yours specifically is made by a company called Caldwell. 

The problem is that the locking device on our Series 140 are nylon pads and yours is a kind of metal fork. The pads just aren't enough to keep the shoe locked in this particular window like the original. 

The good news is that we sell individual components that will approximate your old assembly. See our 15-191 pivot shoe, along with our 15-150D coil spring support and Series 160 coil spring. 

For the 27 lbs. sash I suggest using one S160-6 (6 pounds) and one S160-7 (7 pounds) spring on each side. For the 30 lbs. sash, I recommend using two S160-7 springs on each side. Lastly, for the pivot bar, you can use our 26-021.

These components are sold separately, not in a kit, but otherwise I believe they will function well in your window.