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RE: Triumph mirror thread size
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Posted by Stuart (UK) on Thursday, October 23, 2014 at 16:31
    - in reply to: Triumph mirror thread size posted by lauriecowan on Thursday, October 23, 2014 at 12:38

Hi Laurie,

>as used on mirrors fitted to T140 front brake master cylinders,

Depends.

Original AP Lockheed castings fitted '73-'78 were 5/16"UNF.

Replacement AP Lockheed '73-'78 castings are M8.

'79-on, 10 mm. i.d. unthreaded hole.

Hth.

Regards,