Yesterday afternoon I very carefully cut the new split pin down to size, bevelled the end and shaped it a little with the pliers. With plenty of WD-40, trial alignment and I’ll admit holding of breath (!) I gently tapped it into it’s new home with success! Such a relief!
The actuating cam seems to be working well and I’ve almost fully reassembled the rest of the carb. It’s been a bit of a journey, and that’s without trying to put them back on the car and tune them.
I’m working a bit next weekend but I should have time to finish the reassemble and remount them next weekend… fingers crossed!