Glass!
I've had a wedge of hardened glass in a tyre, almost invisible. It gets pushed in from the outside and becomes invisible from the outside. And hardly detectable from the inside.
In the area of the tyre where the problem is, push hard from the outside with, say, the end of a 6 to 8mm bolt, or similar piece of metal rod or T bar. Press your finger hard up against that spot on the inside of the tyre. Maybe you'll feel something sharp. (I think you will)
If there's glass in there, sticking a patch in the inside of the tyre won't help long term.
And if you use pliers to grab it from the outside, the pliers will just crush the glass where they've gripped onto, and do nothing.
In my case, I felt something sharp on the inside and poked vigorously with a screwdriver from the outside. Inside, tiny pieces of glass appeared as the original wedge of glass broke up. Poke around with the screwdriver until all the glass has come out.
Or it may be more effective to push the glass out by pushing with a screwdriver from the inside of the tyre, if you can see exactly where it is.
Be careful in all this that your screwdriver isn't so big or sharp it damages the tyre!
Good luck!
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