This cabinetmaker/carpenter uses bits of wood for many of these situations. Spindle bore is easy enough to make a bung and drill a hole. Same for V blocks. Surprising how accurately you can make up jigs and fixtures out of Baltic Birch. Takes threads well to. Just tap to 100% thread depth. Holds better than a screw actually. Necessity and desperation make for some innovation sometimes!

Plus I'm not properly trained as a machinist. I learn and do, and read and learn more! You guys are an invaluable resource as well. Never cease to make me think.