We’re starting a historical discovery of how the 1973 GMC serial number 41 windows were put together 
Now painted we’re going after renewing the original 4 section window frames called “style 1”. Coaches up to mid year 1976 used these frames. You can know one when looking at the aluminum frame. You will find 4 sections making up that frame. The later model “style 2” windows were a 1 piece frame having only 1 seam. There are other differences but this one is the dead giveaway. 
These early windows run their slider glass front to back in a felt runner. These runners were wire backed fuzzy stuff. You know when the remnants are original when you see the wire backing left. Hey but Ruby’s windows have contoured synthetic rubber glued in all the way around the frame! Look…. 
The rubber material we use now is not this stuff and it was glued original… no wire felt residue …. from this I’m concluding the prototypes were installing rubber felts until they got into production 
Next, the screens have what I call “spring doodles” little plastic things that spring at the top to hold the screens in their track….. these screens are installed upside down with 1 broken spring doodle … see the flat pale white thing at the bottom of the screen 
Here is it out… the weight was pushing the spring doodle… that’s not right 
Don’t worry Cedric, I can fix that….. so next I have to dig out all the petrified, glued in felts before I can do anything else 
Oh boy, just can’t wait! First step is to remove the original window latch 
The original plastic outside nuts holding the latch in have pretty much crystalized, take them both out and carefully pry off that latch…BTW, do not loose that latch, it’s made of Unobtanium… I have new correct nuts, washers and screws to reinstall them. Next pull off the vertical centerbar pinched onto the slider glass 
There is a replaceable felt gasket on it’s back side.
Now… well, get out some scraping tools, a hammer and a broad selection of cuss words because that glued in mess has to come out! 
This is where I say solong for right now…. gotta get jiggy with the frame. I’ll take pics and post them on installment 3… see ya then…. 
.
.
