Hi Juvela.
The pins are new, but I tried to install them a couple of times, cranking them down as tightly as I normally do.
I'm sending a photo of the flats on the pins, and we can see, here, that there is a transverse slot that has been cut
(by the spindle flat edge?) When I press these new pins down, I see about 8mm of the top showing.
Yes, British, so 9.5mm.