Battery contact cleaner pen

Two examples spring to mind immediately, battery box contacts on Leicamotor for Leicaflex SL etc and back door contacts on M6 (I think).
 
Huss said:
I had no idea this existed, just ordered one. I used to use a pencil eraser.. (worked but left debris behind).

https://www.adorama.com/bycc.html
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Also known as a fibreglass pen - which is what the brush part is made of. Watch out for the fibres snapping and leaving masses of little bits which will get into your fingers. Best is to work over something like kitchen paper that has a fibrous texture that will catch the fibreglass shards then dispose of it afterwards.

I've used them on gold contacts without problem. It's very effective but gentle. You can also get versions with brass or steel brushes. Not sure I'd use the steel one but the brass one is probably better for battery contacts though I wouldn't use it on circuit boards or switch contacts.
 
Glass fibre pens are fine on gold-plated contacts. We use them professionally on such-like; have done for years without any problem whatsoever. As Monopix says, though, watch the fibres don't get into your skin. It's akin to a wood spell or a sliver of copper wire in there - and you can't see it!
 
It's always better using a solvent or a chemical moisture to remove dirt or oxidation.
Contact pen make some micro scratches that help the next oxidation.
 
monopix said:
Also known as a fibreglass pen - which is what the brush part is made of. Watch out for the fibres snapping and leaving masses of little bits which will get into your fingers. Best is to work over something like kitchen paper that has a fibrous texture that will catch the fibreglass shards then dispose of it afterwards.

I've used them on gold contacts without problem. It's very effective but gentle. You can also get versions with brass or steel brushes. Not sure I'd use the steel one but the brass one is probably better for battery contacts though I wouldn't use it on circuit boards or switch contacts.
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Thanks for the tip about the residue
 
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