I have a Janome 6500 and it has an oil wick under the bobbin case in a small hole. Nowhere in the manual does it say to oil it in this spot but my bobbin case was rattling, growling and jumping out of place. It jumped out of place so badly that I eventually put my machine needle right through the case and my dealer kept telling me that it was operator error!!!! I finally found out about this spot after reading the Janome 6500/6600 on-line forum. After oiling it in that little hole, my machine went back to sounding and stitching normally. Now I just add a drop of oil there any time my machine starts to sound noisy.