Nah only the end has a standard thread mate
Yamaha does one side as a left-hand thread so it will some loose if it gets hit.
Both sides are M10 x 1,25 as far as I remember. This goes for compatibility.
The lock nut should be the same thread on the original mirror.
Other threads will vary depending on the manufacturer, depending how/if they set the mirror up. Most will use adapters for their mirror to fit different bikes. May even be a pipe thread ;-)
Your best option would be to get a used broken mirror with locknut in order ...
Are you sure your mirror is original? My locknut looks like the one below and is made from steel not brass.
Andy
