@Map63Vette , I dont know why you are even trying to adjust your glass with totally worn out channel guides, do as
@Dana67Dart suggested and go buy/install new guides and shoes, then read up on how to adjust the glass/vent frame. It can be a little challenging but not that difficult to replace them, and it sounds like you have mechanical aptitude so you shouldnt have an issue, but of course you have to pull your whole vent frame and window assembly. While you are at it, make sure to clean and relube all the moving parts. You may also need to use some spray lube on the inside of the glass channel if rolling the window is too difficult.
As many on here can attest, it can be a real pain to get the whole thing adjusted right, even worse if you have worn out parts.
Word of advice, the new guides will have to be trimmed to length/shape so make sure to compare your old one to the new and mark where you need to cut. Also, when making the holes in the guides for the guide pins, I used a point type soldering iron to melt the plastic rather than trying to cut holes; and make sure the guide shoes are totally clamped together.
Do some searching on this site and you will find threads dealing with this subject already and help if you need it.