I got to page 2 and stopped reading responses, but want to make sure one of them hit on this point.. if not here is new information..
If it was equipted with one from the manufacturer is is required by law and INSURANCE rules..
Here's what has happened to a homeowner..
He was weedwacking, his weed wacker set a pile of leave to smoldering which he didn't notice, he got done wacking off and put his tools away and went inside the house..
the leaf pile caught fire and burned his shed all up, when he went to file a claim with his home owners they wanted the weedwacker for investigation, first thing the adjuster said was, where is the spark arrestor, home owenr said huh? then said after being told what it was, "I was told it was not neccesary to didn't replace it just removed it". the adjuster said thanx and left..
his claim was denied for not using proper operating tools that caused the fire...
He was pissed, he hired a private guy to investigate and a lawyer to sue the inurance company, the lawyer said "don't waste your money, it doesn't matter what started the fire, the spark arrested was missing and therefore the insurance company is not liable to you any longer..
So to me, the arrester is important.. if your running a landscaping company it might just void your business insurance if it is missing or your homeowners insurance...