One thing you can do to condition the runners in which guide the windows is, spray them with a generous amount of WD-40 up and down the channels. Work the switches up and down a few times. You should notice a good improvement. the only other option is to remove the door panels and liberally lubricate the mechanisms inside the door. This can be an absolute hassle on these older model ones in which door panles can be ruined an are very expensive to replace or repair. Beautiful cars by the way, congrats! Let me know if you need anything else.
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One thing you can do to condition the runners in which guide the windows is, spray them with a generous amount of WD-40 up and down the channels. Work the switches up and down a few times. You should notice a good improvement. the only other option is to remove the door panels and liberally lubricate the mechanisms inside the door. This can be an absolute hassle on these older model ones in which door panles can be ruined an are very expensive to replace or repair. Beautiful cars by the way, congrats! Let me know if you need anything else.