Bam! Zach nailed it. Fix it like an EM wiper blade
Per
http://www.pinrepair.com/em/index1.htm
"Fixing a Broken or Worn Wiper Blade.
This information and picture is thanks to Michael Sands.
Sometime the metal fingers on stepper units break, or the contact on the finger will wear out. This can be repaired, as new contacts can be purchased from Pinball Resource. But if the wiper blade is broken, that can not be replaced easily. But it can be repaired.
First shine up the metal on the old wiper blade arm. Cut off the contact if it is still there, but leaving as much of the arm as possible. Note the arm bends and acts like a leaf spring, pressing the contact against the rivets. See pic 1 to the left, showing a damaged wiper arm contact that needs to be repaired in the blue circle.
Next find an old "parts" stepper unit, and cut off the contacts from this parts stepper. Keep the length short because the double thickness of metal will not have the same spring. Shine up both the front and back sides of the cut wiper arm. See pic 2 to the left.
Put some soldering flux on the new and original wiper arms (this will help with the soldering). Clamp the new wiper arm onto the shiny portion of the original arm, in the same position as the original wiper. Carefully note the length! The wiper arm can not be longer or shorter than originally designed. See pic 3 to the left, in the yellow circle.
Solder the new wiper arm in place on the original wiper arm. (see pic 4 to the left). Regular rosin core solder works fine. Alternatively, a silver solder with can be used for added strength."