How to clean and service a Valve (Vintage Series)

the valves from those vintage tanks needed to be services.
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[@harambeexpress]

I thought about getting into gear servicing as a bit of a side gig... I looked at servicing courses (and manufacturer specific ones) but they're not available in my area and are barely available in my country.
I presume it's a lot easier to do when you're properly in the industry with a shop.

[@johannmattis4842]

Warum eigentlich nicht Zitronensäure verwenden statt Ultraschallbad? Das ist sonst hervorragend, um Metall lupenrein zu reinigen.