The fun of restoring an EM. I find that in most cases with intermittent faults, you just play the game and look past the problems for 20 plays and then the game fixes itself. This is what I love about EMs. The ball count unit does need to be rebuilt as it is out of adjustment.
There should be an EM in every collection 
Gday Nino .. yes agree every collection should have an EM ..
I find it bugs me when features don't work so I have to track down the fault .
