I purchased a Stanley Breaker BR85 on ebay for my 443B. Fabricated a mount, bought hoses and mounted it. It worked 5 min then died. Had it tuned, worked 5 more minutes and died. Took it back and the repair guy removed the pressure adjuster, replaced it and it worked again - for 5 minutes. When it worked, it worked well at partial throttle. Is there something about the 443 that is causing the failure or should I be looking for a newer hammer. So far I've only about $600 invested and to get a BOBCAT model I'd spend several $1000. Any hints - places to look, things to check?