Hi everyone. I just joined so please be gentle with me... I have an old Kemppi Super kempomat 150 mig welder that has a problem with the power no matter what power setting the machine is set on it has a very weak arc so weak that it almost doesn't melt the wire. I saw someone talk about this for a long time ago that this might be something about „the heatsink and the the so called polarity screw“ Well, the problem is, I don't know what it means, That is, the heatsink and the so called polarity screw and where it is located in the machine Please excuse my English language and writing With kindness and hope. Thor P.S. I also include pictures to explain what I am looking for.