Removing and checking the flipper coil stop

Steps

• Undo the pair of Allen bolts (10-32 x 3/8 in) that secure the coil stop, then slide the coil out of the way.
• Look for a mushroomed head from plunger impact.
• Measure the thickness with a caliper: new is 0.440 in; at 0.425 in or less, replace it.
• Replace rather than file it; filing lengthens plunger travel, which can wreck the upper bracket and let the pawl hang on the EOS switch.

Systems

• Williams System 11
• Williams System 11A
• Williams System 11B
• Williams System 11C

Related tips

• Flipper rebuild part numbers for System 11
• Flipper rebuild step 1: remove and check the coil stop
• Coil sleeves and flipper rebuild spares
• Mount flipper coils with the lugs away from the coil stop
• Flipper coils have two windings
• How the two windings of a flipper coil work
• Testing flipper coil diodes
• How a System 11 flipper coil works

Source: Repairing Williams System 11 Pinball 1986 to 1990, Part Three, Clay Harrell