What NHTSA says the defect is
A HARDTOP HOIST ACCESSORY KIT WAS SOLD TO CUSTOMERS WHO HAVE THE MIATA WITH A HARDTOP. THE PLASTIC BUCKLES USED TO ADJUST STRAP TENSION CAN BREAK AFTER THE HARDTOP HAS BEEN SUSPENDED BY THE HOIST.
The risk NHTSA states
THE BUCKLES ON THE HARDTOP HOIST CAN BREAK AND RESULT INTHE HARDTOP FALLING FROM THE HOIST, CAUSING PERSONAL INJURY TO ANYONE STANDINGBENEATH OR NEAR THE HARDTOP WHEN IT FALLS.
The remedy NHTSA states
MAZDA WILL REPLACE ALL HOISTS WITHOUT CHARGE.
Campaign 92V159000 · reported to NHTSA 3 November 1992 · Read it on nhtsa.gov →