you do the plugs and i could weld it in for you for a fee
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i have my 200a ac/dc tig running of a 16a plug with a 13a adapter i got from toolstation for £5 had it flat out on my tig and fuse held in ok or if your mig is big enough (250a up) and you have the right gas and wire you could mig it (4043 for cast) heat it up will help fore either way
idea if you have a lathe you could could make a bung to sweat in with some bearing retainer if its round and the fit is right it will stay in no worrys
if you have trips in the fuse board changing the class (not rating) of the trip will make it less prone to nusence tripping i think it was c class that was fitted as my 195a mig was knocking the trip out
