I've been told a standard PST would work myself. You can't buy the blade by itself though, not unless someone here has one to spare (worth asking over in the 'tools wanted' section I'd think).
Indeed,LM support here in Sydney is Fantastic. They swapped the blades for me while I was booking 2 other ones in for service and sharpening. Pieter
Mate are you in Sydney Australia That is BRILLIANT service .I must send in my knackered Crunch I got from Ebay that was described as 'good' condition.