The blade assy. costs nearly as much as a new trimmer.
If you disassemble it, look for a crack on the moving blade, near it's connetion to the motor.
CAUTION: as you disassemble, there is a small "washer-like" bushing that travels in the slot of the blade; this can fall out or not even be seen at first, due to the greese in that area.
tomkae, August 2007