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Howard
nomoreknees
Hi Howard, yes hollotech2 pinch bolt.
The crank has been in place for 5 years or so :D I only realised that the BB had had it when I washed my bike the other day and the loosened the road grime that had kept it aligned.
This is my do everything bike - tens of thousands of miles commuting and off road etc etc.
I think you're right - The bolt must be corroded in place and wedged with flith.
Tried heat, imperial Allan key (just rounded the metal more), torx head hammered in place (just rounded more) and araldite imperial Allan key.
Managed a little turn then the glue cracked.