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With an angle grinder more like than a dremmel or file
measure nozzle and test against bucking blah blah blah.....
should really use something as close as possible to correct nozzle length
it would help if you explain exactly what you or the other guy did or didn't do or how you came about this odd mofo setup
(reason I ask is often a number of things took place and might be more than just one thing that is out of whack - so as much info & honesty as possible will help from the start)