Thanks Daniel, the seating looks ok and the spring has some tension, but there are some others that are gapped wider - but it all seems to function ok now 

Did some more work over the last couple of days and think I've finally sorted all the electrical issues.  It came down to a zero position contact on the bonus unit not making reliably.  It's hard to tell exactly how it should be other than as a change over pair of contacts one should be on when the other is off. The bit I'm not clear on is what position it should be zeroed on - I have made it so that zero is the lowest bonus light on - the only thing I could think is relevant is how SS machines give you the ball again if you score no points - but this machine would never have done that anyway.

More playfield cleaning and re-rubbering, it looks so much better just getting the dirt and grime off - so much more light is reflected and everything looks brighter. The plastics have come up really nicely with a polish of Novus 2.  I've got one to repair.

The chime box needs a bit of work and I've got new sleeves put into the bumpers and slings, but that's for next year.  Next year and the machine being finished are not that far away - think I'll go and have a beer to celebrate.  It's been a good year for me - bought my first and a few other pins    Have a good night all!