Paul, I know Bunning's sell it here in Oz, but basically you need to get yourself some rust converter which is phosphoric acid wash the steel bits in it and then wash in the white spirit and dry in a oven before coating.
Another advantage of buying some phosphoric acid is that you can mix it at a 2:1 ratio 2 parts water and 1 part acid and you have the perfect flux for soldering.
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Sent: 11/10/2021 9:06:33 PM
Subject: Re: [o14] Slaters Lyn
Here is the rather nice 14mm gauge axle?