Hello guys I am relatively new to the forums. I have a problem with an Arc AAA-P. The unit worked and then quit working within a couple of days of receiving it. Now if I take that head off of the original body and screw it onto another AAA-P body it, the head, will work. But if I take the head off a working AAA-P body and place onto the body of the unit I just bought that head will not work on the recently purchased body. I did clean the contacts with a clean cotton swab, but nothing - even if I screw it down quite well. Does anyone have any ideas on the problem? Thank you in advance for any help on the issue. /ubbthreads/images/graemlins/ooo.gif