removing and replacing drivers side window lift mechanism om 73 911

[Sunroof]

From what I gather, the window lift (scissors) unit has a large center spring that adds to the lifting of the window via the hand crank. When cranking up my window, its a struggle so can I assume that the spring no longer functions or is binding? After removing the inner door panel, arm rests and door pockets I am confused as to how to remove the window glass and the entire lift system to replace with a new one.

Can anyone give a step by step procedure for this? Can I just replace the spring unit alone?

Thanks

Bob
1973.5T

[RSTarga]

It is usually the pivot that breaks.
https://www.early911sregistry.org/forums/showthread.php?144123-Help-me-identify-this-piece-of-the-window-regulator&highlight=regulator+spring

[RSTarga]

This should help you remove the regulator:
https://www.early911sregistry.org/forums/showthread.php?101491-The-Canary-Drivers-window-removal-felts&highlight=regulator+spring