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Pig indeed!
The company sent the wrong size for the DR350 back when I did them, but that bike actually have a dozen variations.
This time the in/out diameter is correct but the thickness/depth is many tenths of a mm too thick. Even with absolute soaking in Dot4 and wedging with the ball end of my smallest hex key, no dice.
I rebuilt with the three correct ones and one original, since the original seals were actually fine - only the pistons needed love.
One of those cheapo vacuum bleeder kits has been a gamechanger for brake bleeds. Might even put a one-way-valve on the line to go full shed-mechanic.
Put the original seal back in for that one, with the 3 other fresh seals.
Wasted so long on the front, I haven’t the heart to start on the back.
At least the Hel line looks trick.