$5 from Main Street Pens, described as follows:
Pure, unadulterated silicone grease. Designed to be used on rubber and synthetic rubber 0-rings and seals. This is a lower viscosity grease, i.e. it's stiffer than the stuff from scuba shops, and is more resistant to washing off than some others on the market, and silicone oil. That means it's less likely to get into the ink or feed. You'll find it on my shop bench and on the table at pen shows. You use it on anything that needs to be lubricated on fountain pens like Sheaffer touchdown tubes, plunger rods, Pelikan piston seals, mechanisms etc..... Net wt. 9.5 grams.
You'll spend more money and time hunting for or driving around looking for the right stuff.
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