I bought this trimmer at an auction for $10. It runs great, but it has a problem with the head. The little black piece with the threads on the end will not stay up in the drive shaft. It has a little ring cut out up at the end, and it appears that there should be some type of retaining clip holding it up in there. If pictures would help, let me know. That is the only thing wrong, and I would like to be able to use this trimmer this summer. Thanks
