Hi Bunny, don't know if you remember but that happened to me up in the Yorkshire Dales a few years ago.
I managed a successful repair with 2 pack epoxy glue and new grub screws. I drilled all the way through the pulley and used a taper tap so the new parallel grub screws would not just pass through but would tighten up. These were loctited in.
Fortunately I could get recovery back home to do the repair overnight and then continue the trip the day after. Not that easy when you're in Antwerp though.
