The bolt thing didn't quite work out how I was hoping - I am now thinking about replacing this with the correct linkage.
Anyway, after quite a few games the LHS flipper just died :( Initial trouble-shooting shows 60V available to coil at EOS; as the multimeter is digital I don't know how to measure the voltage during the stroke but something seems to happen. Just to check I tried resoldering the wiring to it but with no difference. Next step is to remove coil for ease of access and check diodes and resistance of coil - I think I will skip that for now and try another day!!
Happy New Year to all. I am guessing there is no-one sad enough to be reading this until tomorrow :)