Buy replacement tanks? You jest
Actually, I have some relatively new tanks that are like the old Patterson ones. I also have a lot of older tanks that were given to me. I am sure its not going to be that difficult to stop the leaks. (its only been recently that they have leaked more then usual).
My thread tape trick worked fine. Yes, I got a bit of leakage from the top cover during the stop and fix stage, but that was more residual fluid from the pour out then from agitation.