A CANADAIR CL65 CAPT RPTS REPAIRING A PAX SEATBELT AND ADVISED MAINT CTL BUT BELIEVES A TECHNICIAN SHOULD HAVE BEEN INVOLVED.

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DURING A QUICK TURNAROUND AT THE GATE; A CABIN CLEANER POINTED OUT A SEATBELT BUCKLE (FEMALE PORTION) RESTING ALONE ON A SEAT THAT HAD COME OFF THE WEBBING -- THE WEBBING HAVE SLIPPING ALL THE WAY THROUGH THE BUCKLE DUE TO THE TERMINATING END (WHERE IT'S NORMALLY ROLLED BACK UPON ITSELF); BECOMING UNROLLED. I RETHREADED THE WEBBING THROUGH THE BUCKLE AND CHKED OP OF THE BUCKLE; AND UNDER TENSION IT HELD THE WEBBING TIGHT; LIKE IT SHOULD. THE ONLY WAY FOR THE BUCKLE TO COME OFF THE WEBBING WOULD BE FOR SOMEONE TO DELIBERATELY PULL IT OFF. I CALLED OUR MAINT CTL; AND DESCRIBED THE SIT; AFTER WHICH I WAS TOLD THAT AS LONG AS THE INTEGRITY OF THE SEATBELT WAS IN TACT; AND IT FUNCTIONED TO RESTRAIN THE PAX; IT WAS USABLE. I WAS TOLD THAT MAINT WOULD HAVE A LOOK AT IT WHEN WE GOT BACK TO OUR DEST. SHE RPTED DURING AND AFTER THE FLT THAT ALL WAS NORMAL WITH THAT SEATBELT AND THE PAX SEATED THERE. I MADE A MAINT WRITE-UP AT OUR DEST; AND MAINT CTL DECIDED TO REPLACE THE SEATBELT. ULTIMATELY; I HAD TO USE MY BEST JUDGEMENT IN MAKING A DECISION; AND AFTER TALKING IT OVER WITH MY CREW AND MAINT CTL; KNOWING THAT OUR MAINT IS ALSO CAREFUL AND CAUTIOUS; I FELT IT WAS A REASONABLE AND SAFE DECISION TO ALLOW THE USE OF THE SEATBELT IN QUESTION.