The shoe grooves may have burrs or dirt.

1. Clean the shoe grooves.
2. Inspect the shoe grooves.
3. Replace the shoe grooves as needed.

Refer to Upper Tilt Head Components .

The shoe lock spring is weak or broken.

1. Clean components affected.
2. Inspect components affected.
3. Replace components affected.

Refer to Upper Tilt Head Components .

The shoe seized on the pivot pin.

1. Clean components affected.
2. Inspect components affected.
3. Replace components affected.

Refer to Upper Tilt Head Components .