Editing Amstrad CPC 664 Maintenance Guide (section)

=== Pinch roller and head pressure ===

Less common than the belt but eventually relevant. The pinch roller is the small rubber wheel that presses the disc against the spindle when a disc is inserted. After many disc insertions, the rubber hardens and develops flat spots, causing the disc to slip at high speed.

* Replacement pinch rollers for the Hitachi mechanism are available as modern silicone-rubber parts.
* Head load pressure: the head is sprung-loaded; do not adjust the spring tension by bending the bracket &mdash; the alignment is set at the factory and is not field-adjustable.