Pinch bolts...5mm. Axle...Don't need one. Loosen the right pinch bolts, then loosen the axle bolt until 3-4 threads are engaged. Loosen the left pinch bolts and tap out the axle until the axle bolt bottoms out, then remove the axle bolt. Use a wood dowel or 1/2" extension to tap it out enough to grab it. First time, it can be a biatch. Lightly grease the axle before installing.