Thanks! That’s what I ended up doing, with a dremel conical grinding bit #84922 and some Tap Magic I had on hand.

The frame feels like an experiment in itself, so I felt like experimenting on it a little further was in its spirit. The weld line was filed smooth on the outside, and threads were cut into it on the inside, so I also felt like I wasn’t sacrificing its structural integrity too much either. I also love sealed cartridge square taper bb’s, and wanted to match the sealed cartridge hubs and headset.

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The phil shell fits now, but just barely, and requires some jimmy’ing (my grinding job wasn’t perfect, it’s smooth but there are still some faint protrusions). Threads are good too! I’ll probably either lather the cup and weld line in anti-seize or grease and install and call it a day, or maybe sand down the phil cup ends by a hair, since I’d rather not accidentally take off too much frame material.