Reclaimed Materials Guitars: Making the First P90 Pickup Prototypes By WP-Admin FVL | Published 26. March 2013 | Full size is 2592 × 1936 pixels Martin 00-18 Restoration: Using an Endoscope Reclaimed Materials Guitars: Finished the First P90 Pickup Prototype Making the First P90 Pickup Prototypes The counter needed to be rebuilt. It is now derived from an optical mouse, and counts pickup windings via USB. It seems to be a bit more reliable than the modified calculator. And of course, it has a laser. Bookmark the permalink.