Well if it was a massive de-tuning then it's done for.
Not true... not done for.
Simply sounds like a broken lug which is the part the tuning rod screws into not he external piece you see.
Take your head off. Check the head and see if the head pop or pulled out.
Get a phillips head screw driver and unscrew the problem lug from from the inside of the drum. See if it is cracked etc if so order a new one. It will cost you a couple of bucks (maybe $10-12). You may need to get a new spring as well.