With the help of several people on this forum, I fixed my Williams San Francisco! Everything mechanically has been working very well. I rebuilt the flippers this past week and yesterday cleaned up the playfield and installed new rubber rings. We played three or four games, then something went wrong. The 1 point relay was going nuts! After turning off and back on. I went back around and triggered all the springs on the playfield that give 1 point, in particular ones that have new rubber in front of them and all seemed to be fine, nothing holding a leaf spring closed. I put the ball in play and the movement from loading the ball caused the problem to start up, so I think something must be loose under the playfield. Time to start poking around again... there's a lot of leaf springs on this thing that trigger the 1 point relay.... We were just about to move it to its permanent location! Delayed again!

And now it’s fixed. One spring gap just a tiny bit too close after I stalling the new rubbers. Made a slight adjustment and all is good. Now time for cosmetics!