When those Delta brakes first came out we built up a bike for the owned of the shop. He took it round the neighbourhood for a spin and came back, planning to do the usual ride up the pavement and up the front step and in through the shop door. Only, due to the poor quality of the brakes, he ended up coming at the door with arse on the top tube and both feet on the ground fred flintstone style, brake levers mashed to the bars. We all laughed so hard. He cursed us out and we mucked with those brakes for a couple hours over a half crate of ale. Only ever got them to work a slight bit better. I couldn't believe all the mechanism in those brakes.
Run the cable in long with the bonnet off, solder it in place, remove the cable and trim to length.
We used to lovingly refer to Synchro as Stynchro. I got the idea. Friction, Indexed, ability to run different freewheels and different speeds with the various coloured inserts. Record C required a freewheel at first, don't forget. But we had more than one bike come back with a very cross owner upset about the crap shifting of his very expensive machine. And I know at least twice we put the incorrectly coloured insert into the lever and it worked markedly better for it.