Ok, so I bought Einhell BT-GW150 today. It's a small MIG, range 25-125 A. I seem to have a problem with wire feed. While it feeds wire (0.8 mm) ok, the feeding mechanism makes a loud grinding noise while the trigger is depressed. It sounds really wrong somehow, should it make that noise or not? I know it's a cheap feed mechanism with just two rollers and small motor, but this noise seems excessive. It looks much like the SIP wire feed. Does that wire feed also have grinding noises while working? I am trying to determine is it normal, or should I take it back to the store. Apart from that noise, welder works and welds just fine. Any help appreciated.