Small Engines (Lawn Mowers, etc.): troy bilt string trimmer, weed trimmer, hello bill

Question
The head of my troy bilt weed trimmer will not stay in place and comes loose from the shaft. What can I do to fix it?

Answer
Hello Bill, I would need more information in order to answer your question. How does the head of your unit attach? What is the model number? Feel free to ask again with just a little more information and hopefully I can help solve you're problem!
Jason