Arc-shaped wear marks under the flipper bats.

Flipper drag marks on the playfield

Cause: Worn or cracked nylon flipper bushings let the bat sag onto the playfield.

Checks

• Look for bat contact with the playfield and a cracked bushing.

Fix

• Replace the bushings; new ones stand slightly taller (about 1/8 inch above the playfield).

Systems

• Electro-mechanical

Related tips

• Gottlieb EM flipper rebuild parts
• Flipper bat drags on the playfield
• Flipper stays up after the button is released
• Sloppy Gottlieb flipper: loose pawl collar or pin
• Sloppy Gottlieb flipper: worn shaft and shoe joint
• Rebuilding an EM flipper
• Which games have zipper flippers
• An EM flipper coil is two windings

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