The new rollerball ones will burn out a pcb on the head though. Much easier to change a cheap clutch! Any local repairers in your area from the repairer section of the forum? Otherwise you will need a long t25 driver, clutch and belt lifter tool, and about 20 minutes! They do wear out sadly, the little white wheel normally wears on one side, which throws the belt off.
Brush roll rotate OK by hand?