Identification of Channel Balance

A quick learner from Jacksonvile, Fl says:
After 10y in the sun the plastic top and shoes in one of my aluminum windows will not seat properly (end up above the window). I'm unsure why because they look OK and any ideas would be appreciated.

I suspect I may need at least the end fittings but I'm unsure which channel balance and end fittings to buy.

The windows were made by Kinco. The bottom sash weighs about 20 pounds. The channels are 30" long and 1/2" wide. The numbers on the channel are 29 3 ET CMC 4. The top appears to be a 19-005. The shoe is winged and the key dimension of the shoe is 1 3/64 which is between the two you offer.

Also, the shoe has a plastic screw showing through a hole in the front of the channel: perhaps for adjustment. The shoe looks like the one shown in the March 8-12 exchange with Tom in your discussion board.

Thanks in advance.
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Paul from SWISCO responded:
Thanks for posting! I don't think it's a problem with your balance, but rather your top sash guides, which are what keep your balance from shooting out the top of the sash. Take a look at either our 18-044 or 18-166, both of which are used for Kinco windows. Let me know if you think these could be a possible solution.
A quick learner says:
I believe you are correct. I found the top sash guide and it matched 18-166 except that the bottom half was missing due to the force of the spring in the balance. I'll order some parts and we'll see what happens.
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