3. All can be under the apron or 1 to 2 may be in the upper lock with 1 or 2 under the apron. Game should also start if 1 (only 1) is in the shooter lane.

One thing to be aware of is almost all of these leaf switches were assembled wrong at the factory with one blade installed upside down. They can be disassembled and corrected, but the one contact may be damaged from being worn by the backside of the upside down blade. Once the gold plating is worn away, they will be problematic. I've been gradually rebuilding my switches with parts from Pinball Resource.