For the first time ever, I used the little drain screws at the front of the boxed cooling pipes and of course found the drain screw port threads were shot and I can't get a drain screw to tighten up. I don't plan to use these drains anymore (I'll go back to using the radiator drain plug). Do I: 1. fill the drain port with JB weld? 2, slobber JB Weld on the screw and then shove it into the hole? 3. Tap for a larger size bolt (which I really don't need to do since I'm not going to use this as a drain). 4. Some other option.....keep it simple.