It sounds like you should be GTG if you can get the more accurate balance working. 7 kernels of Varget is approximately 0.15gr, which would certainly work, but I agree with you that a little better resolution would be an improvement. Hopefully, it won't be too difficult to get it repaired. Good luck.
Should be very easy to repair. I work for the USDA, and the lab people have a very different approach to equipment than I do as a research technician. If it breaks, they just replace it because none of them know how to turn a screwdriver. I personally can't stand wasting tax payers' money when something breaks, especially when all it needs is one piece of sheet metal being bent back into shape. Unfortunately, if the balance was purchased with federal funds, they have to surplus it. But if it was purchased with soft funds, I can take it home.