As it always happens, I urgently need an X12 mech hanger. The one that's used in Syntace X12 system, that fits similar to a PM brake mount.
On Sunday Bank Holiday Weekend to make things worse.
In London or on the way to Forest of Dean.
P.S. It's the actual hanger I'm after. I do have a new bolt bolt but the threads in the hanger are stripped so I probably do need a new one.