Thanks Nino - problem solved.  Tried wiggling the tabs under the socket and the connection came good.  Have realligned the flippers as well, ready to have a bash now.  Will probably struggle due to the new flipper setup (that's my excuse anyway)

Also had the wire ramps off yesterday and gave them a good polish with Brasso.  The yellow rag finished up half black, but the ramps look much nicer.