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I notice there's a little off-set in the front of your quad - and it looks like some overhang in the back?

Fun fact; The ZMR 250 frames aren't all symmetrical, they actually have a front and a back. Either the front or the back, however you build it, has about 1 mm more material.

This spacer fits perfectly on standard ZMR frames, I'm curious to know which frame this is.