I promised to let you know how things went with the Gustav Becker that I mentioned yesterday.
I'm fortunate in having an horology centre reasonably close to me, with weekly sessions, and an instructor in attendance. I took the clock along today and had it looked at. As I feared, the pallets were 'out', courtesy of a former 'repairer', but an hour or so of me adjusting them (the instructor says what's needed and then leaves you to get on with it) has now resulted back home in 6 hours of continuous running, the first time it was set-up. Woohoo!
As a guy at another bench at the centre said, as I was grumbling about having to disassemble the whole clock at home several times for a number of failed adjustments during the week (having discovered you can't take just the pallet out on these clocks, the plates have to come apart each time), it does get easier as you get more familiar with it.
However, I kicked myself today when the instructor pointed out that, during the trial-and-error pallet adjustment (I didn't have the manual or any means of actually measuring the pallet drop etc.), I only needed to put in the pallet, escape wheel and fourth wheel to see if it was going to work.
Pretty obvious, really, but why hadn't I thought of that, when I'd been laboriously putting everything back together each time I'd worked on it?