Review on Uxcell H15D15 Coupling Coupler Connector by Tony Suggs

I ordered and received the 6mm shaft version. "Bottom mount screw hole" shown in the table is M4. No, that is not so. This is a through hole (as expected) for the M3. M4 does not fit. It would be possible to cut a hole that would probably cover the M4 threaded hole, but this would require modifying the part it attaches to. I suspect the smaller 5mm shank is listed incorrectly in the chart as well.