>Maybe something like CRC / WD40 but how long does that last ?

You could try silicon grease
http://www.rfoot.com.au/MSDS/Q43%20Silicon%20Grease.PDF

I used to use it on my boat and scuba gear.  It won't dissolve some =
plastics
like some petro-based products can.

You can find it at a bearing supply, or sometimes surplus on ebay.

Jay

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