I have a d16 trans that was dropped on the ground. It fell on the 32mm side fill hole. The opening is not a perfect circle and the plug won't thread in. How can I fix this? Heat it up and thread the plug in? Get a tap and re-tap the threads? I have a track day coming up and I don't think the dishwasher discharge hose and a 3/4 inch copper cap jammed into it will pass tech inspection.

 

Since no one else has an answer, try some J-B weld. With enough J-B Weld you can fix anything. Clean it and score it before it goes on. I don't know about the inspection, but if you do it right it will hold and seal.