What was found
(CAN) AIRPORT PERSONNEL APPROACHED MAINT WITH PIECE OF METAL THAT HAD BEEN FOUND ON RUNWAY. SUSPECTED IT WAS OURS DUE TO COLOR. IDENTIFIED AS A BALANCE WEIGHT ASSY FROM ELEVATOR TRIM TAB ON A SHORTS SD3-60. CHECKED A/C AT THE RAMP, FOUND THAT A/C HAD TAB WITH MISSING BALANCE WEIGHT. IT HAD APPARENTLY BROKEN AWAY UPON LANDING. PILOT RECEIVED NO INDICATION THAT PART HAD SEPARATED DURING LANDING PHASE. A/C RETURNED TO MAINT, REPLACEMENT TAB WAS INSTALLED. AREA OF SEPARATION IS IMPOSSIBLE TO SEE. TAB CONTROL ROD MUST BE DISCONNECTED SO TAB CAN BE DEFLECTED ENOUGH TO GIVE BALANCE WEIGHT A GOOD WIGGLE TO CHECK FOR POSSIBLE SEPARATION.