I am having problems with my Janome MC 6600P with the needle threader. Do they wear out? I watched a YouTube and saw the way it works but mine is not grabbing the thread anymore. No damage has been done it is used a lot since the summer of 2012 may have something to do with it.. Another issue is it is to do miracles with the Accu Foot a built in walking foot doing from slippery, sheer, heavy fabrics. My problem is with the knits and sheer fabrics. When I start it jams down in the needle hole of the needle plate. Anyone have any suggestions as to how to stop this anoying habit? It will bunch up so bad sometimes before I realize it that I have to cut the jammed threads and hope I salvage the edge of the fabric. Lots of time I am not able and it is a chewed up mess. I use a Schmetz and now looking at the Janome site it says to use Janome needles. Is that necessary? Thanks for any suggestions. I appreciate it.