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Since I'm also stuck inside I'll give remodeling a head a try.
I'm planning to make a copy of this AM Rumble and modify it into looking like Banzaitron and then make a recast in resin after things go back to normal; however, I don't trust resin to become good balljoint cups so my plan is to also cut up a slot behind the head and glue a factory plastic balljoint
I'm going to need a 4mm balljoint to make the cup. What are my options?
I checked the Wave and Kotobukiya kits and I found nothing of that size. I can't use one of the original balljoints because it's clear plastic and I trust that even less than resin.
