mysher

You know, I wondered about the check spring. I will have to inquire with the dealer but I would suspect no as I've had these issues since I bought the machine. Also, I do notice how "things" seem to change depending on how full the bobbin is. It even sounds different, but no matter whether full, half-full or quarter-full, I'm having these slips as I'll call them. This machine is a sitdown longarm. I have watched Jamie Wallen's videos on tension, oiling, etc. so I have checked for specks of thread etc under the bobbin spring and try really hard to keep the bobbin area clean. Only thing I have not tried is the magnaglide prewound bobbins.
I notice, too, when using cotton batting that there is lint which is why I try to keep the areas clean to no avail.