Now that I've cooled down some more tidbits...
You really ran a RH tap through it?
Yes I did & got a right hand thread mirror mount to tighten up on the master cylinder side, then much later after failing on the clutch side, was able to get the original left hand thread mirror mount started again & fully tightened (without any LH tap).
The PO did something to the mirror mounts. I don’t know what. But I first tried just putting the mirrors on complete but they would not go. What threw me is he messed up the threads just enough that I was able to start the master cylinder mirror by turning it to the right in the LH mount a turn or so; so I thought the RH went there & the threads were just a bit messed.
Next I separated the small mirror adaptors from the mirror itself---a big mistake
! I then walked away for awhile and went out & bought a tap & die set to clean up the hole in the master cylinder. I came back & tried to thread just the adaptors into the mounts because it was easier to horse them around without the entire mirror on. Then I reamed out the master cylinder with the RH tap & mounted the adaptor. As I beamed at my accomplishment, I then tried putting the master cylinde side mirror onto the mirror adaptor I just installed. Hmm, that won't go either so out comes the RH tap again. Now the adaptor is steel instead of the soft aluminum of the master cylinder so I had a much tougher go & stopped after only a short while. I figured great, need a new adaptor so I removed it & threw it in the trash can.
I moved on to the clutch side----Hmm, that won’t go either & I don't have any left hand thread taps. I go up to the computer to try & order both mirror adaptors & the clutch side mount since it is a separate piece. Damn, can't buy just the mirror mounts without buying entire new mirrors. Check Ebay, no stock mirrors there. Back to the garage to fish out that mirror adaptor I threw in the trash. Now normally no big deal, but I just completed an oil change on the truck & a brake line switch on the dirt bike so of course that steel adaptor vanished to the bottom of a pile of nasty rags, oil quart containers, fast food garbage etc. After rooting around awhile it was exhumed.
I started flipping though the Dennis Kirk catalog for mirrors…..but what’s this I see?…..the LEFT HAND THREAD GOES ON THE RIGHT SIDE….the catalog explains. The color quickly drained from my face & I felt like I was about to throw up.
Now I was the one that ruined all the threads far more than the PO did. In my infinite wisdom of removing the mirror adaptors from the mirrors I assumed the left hand thread one went to the left & the right hand thread one went to the right…..why else would they make them different? WRONG!
So I took the RH mirror adaptor I tossed & put it on the clutch side, went in without much fuss. Now I tried to put the mirror on—this is the adaptor I somewhat tried to tap----& actually got it on & it turns OK---whew, good.
Now on to the bloody master cylinder side I was just hours before cleaning aluminum shavings from. Like I said, I don’t know how, but I got the LH thread started & fully tightened despite completely running a RH tap through it. I’m not touching it ever again. Its tight & until God looseness it I won’t be touching it again.
The lesson boys & girls:
#1 Never separate the mirror adaptors from the mirrors as you will get them confused even after marking them “L” & “R”.
#2 The LH thread goes on the right & the RH thread goes on the left. Go figure.
I told you, long & embarrassing.