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Howard
@motoko the thread on the bore has gone, so even with the intact o ring and ptfe there was nothing to grab.
I took a look at it further and it appears by the cap is purely a reservoir. There is a small hole that created the closed system the moment you pull the lever. I suspect that just there is absolutely minimal pressure on this top cap thus the glue ive bunged in will hold and the extra safety net - Glue may be my unsticking on a hill, ha! - of a lovely gluey cap over the top to increase the adhesive surface.
Either way i've closed the 20+ lever / groupset chrome tabs i had opened and consider this resolved. Dura Ace 12spd where art thou? :)
20 degrees tomorrow... better wash the summer kit!!