After a flipper rebuild, one flipper moves slowly with no snap while the other is fine. The mechanism is aligned and the EOS switch is new.

Flipper slow with no snap after a rebuild: EOS lead on the wrong coil lug

Cause: One EOS switch lead had been soldered to the wrong lug on the coil.

Checks

• Compare the coil and EOS wiring with the other flipper and the manual's flipper diagram.
• Measure the coil's power and hold windings.

Fix

• Move the EOS lead to the correct coil lug.

Systems

• Williams System 11A

Games

• Pinbot

Related tips

• Every System 11 flipper has an EOS switch and coil diodes
• Mount flipper coils with the lugs away from the coil stop
• EOS capacitor for parallel wound flipper coils
• Weak flippers from pitted EOS switches
• Weak flipper: dirty end-of-stroke switch
• Flipper coil burns or flipper very weak after a rebuild
• Flipper coils have two windings
• How the two windings of a flipper coil work

Source: Pinball Repair help group!! (Facebook group)