broken mechanism for spiral tilt windows

Folks,

we bought a house with 20 year old replacement windows. The original installer was Bristol Aluminum from Bristol, RI. They claim they have no replacement parts for the windows that were made in Smithfield, Rhode Island, by Riverdale windows and Door. The installer was less than helpful.... your website is terrific. i have only taken apart one window, as pictured, that is a double sided failure. 

 Many of the remaining windows sag, or are stuck, or have no balance tension. the glass has retained its seals, and the windows do not leak air. other than the problems with the spiral balance, i am happy.potential purchase - repair parts for four windows, plus the Charging tool

you guys are the best! after being totally frustrated by the willful ignorance of the local installer, i think we are getting close. :-)

it seems to me that the spring loaded pivots bars are ok. they extend 3/8", are 1/4" wide and are 1/8" thick.

and the pins on the spiral mechanisms appear intact.

the shoe measures 2" x 1.25" x 1/2"- the blue disc has a 3/8" x 1/4" opening

The spring casings appear intact and functional. the tube is 16" long and 1/2" in diameter.

neither of your balance tubes appear to be a direct fit - and i don't think mine need to be replaced.

For the moment, with just one window disassembled, it appears i will need some shoes and a charging tool- once we are confirmed with appropriate shoes, i'll look more closely at the other difficult windows.

I'm doing this so i can clean the windows for my wife..... is there a particular motion that may have broken the shoes by the previous owner?

thanks again!!!