I use a spray graphite that works great. Comes in a small spray bottle, about $5. The fluid evaporates leaving the graphite.

It has made worn tumblers work where other lubes haven't.

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)