Hi I wonder if anyone can help me. I have just recently inherited a Ryobi Weed Wasp. It runs really well but the head with the spool on is lose and the clamp is as tight as it can be. Also where the end of the flexible shaft goes into the gearbox (that the spool is attached to)it is rounded out so the spool wont spin does the gearbox come apart and can I replace the worn bit or do I have to replace the whole thing. And if so can you buy them and how much do they cost. Many Thanks. Al-Man new