see article on this site " how to attach fan belt to Flymo hover 330. the author of this has obviously had some experience of changing the drive belt ( it's like a fan belt on a car) he also gives advice on the tools required., although i suspect the Torxkey he refers to is a T25 or T27 as i could not find size T26 listed anywhere.
Best of luck
Alan
alan abbott, April 2007