I'm removing the front tire on my std in order to get a new tire mounted and install new brake pads.....got the brake calipers off and hinging nicely....removed the speedo cable, tucked away safely. When I attempt to remove the axle nut, the whole axle appears to turn. Am I supposed to secure the left side of the axle with a hex key (size?) or should the pinch nuts hold that side......

All suggestions welcomed. Thanks.