6 Next, it's time to remove the pinion nut. In order to do this, you need something to hold the companion flange so the pinion won't spin. We drilled a piece of angle iron (arrow) to match the holes in the companion flange and simply locked it against the workbench. This homemade tool is also essential for installation. The pinion nut takes a 36mm socket, and it will take some effort to loosen it because the nut was staked after installation.