Mr Tilt, wouldnt cashbox just send their tech to your house with the exchange playfield and do the changeover at your house ? (easier for you)
It would be easier n cheaper for Stern and its agents to just send u a naked playfield, but if u are not going to install it, it might start a trend of people asking for spare playfields if they have a small mark etc. Either way, hope it works out for you, and am glad the opto is fixed etc.
Now go and play 100 games and catch up on the fun factor ! Crank the volume and keep those neighbours happy