Ross wrote:
The V8 front vent windows have a completely different system than the earlier cars. There is a nylon cylinder that slips over the D-shaped vent window axle. There is a loop of metal that acts as a brake on the nylon cylinder to control the opening friction.

Trouble occurs when the nylon bushing splits after the first 40 years or so and the D-shaped shaft acts as a cam to jam it up rather than rotate it.

Fame and fortune awaits the young man who 3D prints these bothersome boogers as a reasonable cost. I will take two. At least.