From reading the pusher bar description & looking at the photos, it seems like it's centered by the flexing mechanism of the bar itself & maybe some kind of guide before the vise so the piece in the actual tube remains centered. I imagine it like a piston in an engine cylinder with the bar sticking out of the end. I have big hands so I like the 1.25 wrath tubes. I'd also like to try the ego adjustable ones but I'm still waiting on a standard vise adapter. This looks like it takes care of all that at once. Curious about the actual carts in the video. Also the reverse threading
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