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I'm trying to upgrade the attachment points for my GF-01 and as far as I can tell the 3x14mm step screws are unique to Tamiya. I did manage to find the side-grade component (OP-1409 Tamiya 54409 3x14mm Low Friction Step Screw). In a move that is fairly baffling, they have molded the 3.78mm in to the chassis components - requiring a bushing/bearing/flange/eyelet/adapter (call it what you will) to keep a standard M3 screw held firmly. The more common 4mm (id 3mm, od 4mm) are too big for the molded holes. I know these components must exist: I see them in some of the member builds and I see them in GPM and other manufacturer ads on ebay and aliexpress. But I can't seem to find them anywhere. My goto location (McMaster) doesn't carry that non-standard size. Does anyone know a good source for the 3.78mm adapters needed for mount 3mm through rods (or screws) in place of the existing 3x14mm step screws? Flanged/flangeless it not particularly important to me. Any info is appreciated, pictures attached of the screws, usage example, and screenshot of mystical flanged bearings in the wild.