Tricky window

Hi, all,
Last week I repaired my first DH window with new pivot locks and balances (thanks to Paul) and feel confident of my skills.
Moving on to the next window, I'm completely stymied. The window (Thermal-Gard) is a teast 20 years old and has top-mounted tilt latches, pivot locks (one broken) and spiral balances (both broken). The sashes move up and down but won't stay in place; I expected that. But I am not able to tilt the windows at all--they just won't tilt in for removal. The sash did have a 3rd tilt latch on the bottom rail so I was able to remove the lower sash. But I'm not sure what I've gotten myself into now. Is this really a tilt-in, or is it non-tilt?
I'm stumped. Once I know, I'll be able to place an order.

Thanks,
Barb

Hi, Paul,
I've attached many photos, as requested. Also, the channels are metal. In addition to the frame, both jams have pieces of light-weight plastic (pictured) that have bent metal "springs" inside that may act as a seal--you'll know.

Let me know any addl info you might need.

Thanks,
Barb

Last question about this: the tips of the old spiral balances were red but the window weighs 19 lbs. Should I get s stronger balance?

Thanks!

I wanted to post this for other owners of old Thermal-Gard windows who have the same problem I had posted, that the sashes won't tilt in even though there are spiral balances and pivot shoes. Whoever installed the windows put the tilt latches on the bottom of the sashes instead of on top. The only thing I can do is move the windows up and down, or remove them, but they can't be tilted unless I could devise a way to reconfigure the hardware. With winter coming on, I'll be happy just to close them.

After all your assistance, I wanted to post the solution.