Update : Have finally finished overhauling steppers and score reels .
Have cleaned and tested 50/100 switches on the backboard so far.
Still need to clean and test all switches on the playboard and under the playfield .

Today, for something different, I pulled out the lock down bar mech and cleaned it up with the help of some Ranex (great stuff that is) + some elbow grease.

Here's before and after pics of it