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I need to replace the brake bleed nipple in the Grimeca front caliper.
Where can I buy the original type that includes a ball?
Or can I use a conventional one with a taper seat?

Ive done the latter before now and dispensed with the ball-bearing.

Ive also spent days trying to bleed a Grimeca caliper before I discovered there was a ball-bearing blocking the passage....reverse bleeding with a syringe was messy

Having a steel bleed nipple bear directly on the seat can tear them up badly over time. Having access to a lathe, I modify standard nipples.

Paul,
That's interesting.
Do you modify the bleed nipple to accommodate the ball bearing?
If that is true what diameter ball bearing do you use?