Fine metal filings collect on the cabinet floor and coils feel sluggish.

Metal filings on the bottom panel from metal coil sleeves

Cause: Factory metal coil sleeves wear as the steel plunger rubs inside them; aluminum sleeves can wear right through.

Checks

• Look for filings under flipper, slingshot, bell, chime and pop bumper coils.
• Pull the sleeve and check for a worn groove or hole.

Fix

• Fit new nylon sleeves on all busy coils (double-flanged ones on bell coils).
• If the old sleeve will not come out, replace the whole coil.
• Nylon sleeves also give the plunger a dry slide and more snap.

Systems

• Electro-mechanical

Related tips

• Coil sleeves and plungers to keep
• Renew sleeves on flipper, pop bumper and sling coils

Source: Repairing Electro-Mechanical (EM) Coin Operated Games to 1978, Part One, Clay Harrell (pinrepair.com)