The lower left flipper is too weak to make the orbit shot.
Weak lower flipper: a cocktail-table coil fitted instead of the upright coil
Cause: A previous owner had fitted coil 315-1-18, which is meant for Allied Leisure cocktail tables (weaker on purpose). Upright games use 315-1-37, whose power winding has lower resistance (about 2.2 ohms against 2.7).
Checks
- Read the coil number on the wrapper, or measure the two windings and compare with the other flipper.
Fix
- Fit the correct upright coil, 315-1-37.
Games
Source: Pinball Repair help group!! (Facebook group)