Like all restorations it just keeps growing, all the lamp inserts were loose so are now out and i have noticed that all the coils have been oiled and are now gummed up and slow feeling so i guess they all have to come out and be cleaned...... why did i think should a pinball machine was going to be different to a car or a bike resto 
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Yes - this is exactly the road you go down once you start tinkering with a machine. The playfield was just a teaser, the underside mechanisms will not be the last thing you look at !
With regard to the residue left by the contact - this is a GOOD ! Much better than lifting paint ! You can try white spirits, or for stubborn residue - Goof Off on a rag. This stuff will remove the glue, but be VERY careful as it can lift paint !
