So, I did the mirror fix today on both mirrors, here are some photos and description of the process.
Started with disassembling the nut and two washers
IMG_5045.jpg
I put the nut and two washers back on the post for safekeeping.
IMG_5046.JPG
After clamping the piece in the vise, I used 3 different drill sizes, going up slightly larger diameter until I got to the tap drill size for an M6 x 1.0 bolt.
Tap drill size is 5 mm, which equates to 0.197", I have a numbered drill set, which I had from my toolmaking days.
The aluminum can gall up pretty quickly, so be sure to drill down a bit, pull drill out, blow the hole out with compressed air, drill a bit more, and repeat. I didn't go any deeper than the existing hole.
IMG_5049.jpg
I used a self centering tap first and then chased with a flat bottomed tap to get the threads all the way down.
Be sure when tapping to go down only a few turns at a time, then pull tap out, blow out the hole of all the Aluminum chips you just made, blow all the chips off the tap and repeat. I used WD40 as coolant to lubricate as I worked the tap down.
I put a black mark on the tap so I knew when I was near the bottom of the hole. It is very easy to go too far especially with the soft aluminum, and the last thing you want is to break the tap.
I put the M6 bolt in after tapping the hole, to see if how far down the threads go.
IMG_5051.jpg
Since it didn't quite sit flush to the post, I filed off the bolt with a coarse file until it did. I removed maybe 1/8". Then the bolt head bottomed on the post.
IMG_5054.jpg
I happened to have some stainless steel washers, which fit perfectly into the hole and the center hole was large enough to clear the post. I couldn't believe it, no mods required to the washers.
I used 4 washers, which measured about 4 mm which is the distance from the top of the post to the retaining ring slot.
Then on top of that I used a smaller washer (with a hole slightly larger than the 6mm thread diameter) and lock washer just to prevent it from backing out. Guess you could use thread locker instead.
IMG_5056.jpg
Then start screwing the bolt down. Make sure the washers get pushed down over the post, you may need to manipulate them a bit.
Then it should like like this. Bottom out the bolt, the small washer that you added will stop on top of the post and you will have the correct depth.
You can see in the pic that there is just enough clearance for the washers to go into the hole opening.
IMG_5065.jpg
Mount the bracket to the fairing.
IMG_5066.jpg
Before you install the mirror and post, make sure the rubber cover is on.
IMG_5067.jpg
Peel the rubber back and get the two small washers and the lock nut on and tighten the lock nut.
IMG_5068.jpg
cont. on next post.