The driver window switch is very hard to depress to lower the window. the up side is ok. i took the switch apart and cleaned it with contact cleaner. reassembled. it still takes alot of force to push down the lower side of the switch. Any thought on what can be wrong? Switch is out of an 85 300d.

thanks
Cliff

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1983 300d~250k Sold
1985 300d~185k
1999 Volvo V70 wagen 109k
2001 Dodge Ram 1500 78k