I know how to remove the bobbin case base because I've done it on other featherweight machines. The problem is I can't rotate the bobbin case base around to the point where it can be removed...it won't budge. I've removed the gib screw and pulled the gib out. Thanks for the advice, but I think this one is going to be very difficult. I just hope I can eventually accomplish it. Maybe someone else has some ideas...I hope.