When you pump grease in does it come out anywhere? If not, how do you know the grease is getting to the bearing face and not just packing the stem tube?

I must admit I was surprised at the dry state of my 14,000 mile old head bearings when I serviced them recently - if adding a single nipple there works it would make servicing much easier but I can't see how the grease gets to the bearings effectively.

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Simon

Brighton, UK