What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-5) On take-off roll, aircraft developed a vibration which the pilot believed to be a tire. He noticed the left engine began to vibrate severely, so he aborted the take-off, within approximately 400 feet and shut down the engines. Inspection revealed the left propeller spinner torn and one blade counterweight missing. Counterweight assembly has not been located.
As the FAA filed it
(-5) ON TAKE-OFF ROLL, AIRCRAFT DEVELOPED A VIBRATION WHICH THE PILOT BELIEVED TO BE A TIRE. HE NOTICED THE LEFT ENGINE BEGAN TO VIBRATE SEVERELY, SO HE ABORTED THE TAKE-OFF, WITHIN APPROXIMATELY 400 FEET AND SHUT DOWN THE ENGINES. INSPECTION REVEALED THE LEFT PROPELLER SPINNER TORN AND ONE BLADE COUNTERWEIGHT MISSING. COUNTERWEIGHT ASSEMBLY HAS NOT BEEN LOCATED.