Welch plugs, some advice please.

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OomD

Grey Hound
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Can you use a 34mm welch plug if the original size should be 33.6mm? I'm sure it can be tapped into place, it's only 0.2mm all round that its bigger... but is it a good idea?

And, I can't get stainless ones, only zinc plated. Should I paint it with Indian Shellack? Or is it okay to use as is?

Thx!
 
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