I have a 59 blue tint sa200 that I have completely rebuilt. I upgraded and replaced everything on the machine except for any of the coils. I've put about 350 hrs on the machine and haven't been able to get it to weld like it should. I set the rack on the punch marks and have not tried rolling it. I checked my shunts today and I'm getting 35.5-35.6 ohms. I've seen where they need to be around 41ohms but haven't been able to find a definite minimum that they can be. I'm thinking this could be some of my problems. What do you guys think?