A guild member has a Janome and her bobbin case kept jumping out. The janome dealer didn't know what the problem was and couldn't help. She said she even called a jamone tech and he didn't know either. One of the guild members said oil the wick and showed her where it was. That solved the problem. The guild member told the dealer about oiling the wick and the dealer insisted she should never oil the machine! The wick wasn't a wick for oil. I won't repeat what the guild member told her but I bet the dealer won't tell any one else not to oil the wick. LOLOLOL
I am not surprised any more how little machine dealers know about what they sell. They just know how to make a sale.