It's original, as johnm and Richard Tool said.On my oil tank I noticed what looks like an overflow tube is pinched and brazed shut. It also has a small hole drilled in the side upper of the tube. Is this a modification and if so why?
The 13mm brake mod from Old Britts? If not there, where? Thanks.Then the piston comes out of the master cylinder looking that rusty, it likely scored the cylinder walls and will never pump up well after that...
(bore and sleeve is the best fix if that is the case)
Wow, that was quick. I measured 4.0mm on the bearing from the other control with my micrometer. Just curious as to how you came up with your answer? Congratulations on the correct answer, sir.It's approximately 4.0mm but could be an Imperial size so is perhaps 5/32"?