Hello, I'm fairly new to Wire Edm and I'm having a problem with my RA-90, when I autothread the wire will thread fine and go through everything great but when the wire is done being threaded the guide pipe stays down and air keeps shooting out of it. I asked my service guy what to do and he told me to adjust the pipe holder in the back of the machine but after fiddling for an hour and a half I can't seem to get it to work. Anyone have any suggestions on what the problem could be? Just keep adjusting and testing or could it be something else?