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Totally didn't expect this to happen...
I tried to see if wolvrine's arm can be pop off for custom purpose. The ball at the shoulder is hard to come out but the peg at the bicep is, and turns out the upper arm has the same engineering as typical
mafex so I swapped a ko mafex comic wolvrine arm on it and it just work, though it's not a perfect fit. The head is also compatible interestingly.