Some time ago I noticed a clicking noise somewhere in headset area. Noise appears under pressure, also it clicks when I tightening the headset. First thought was that problem is with headset bearings, because steering was like "indexed" in center.
So first what I did - replaced bearings and greased everything. Indexed steering had gone. But clicking noise remained. Yesterday I removed mudguard to check fork for the cracks and found this small hole where fork meets steerer tube. Can it be source for clicking noise? Is it dangerous to ride with it?