Ok so the last post was in December, but I have something that might be worth while, even if late. Please allow me to contribute my 40+ years of sewing knowledge. Your old metal case, metal gear New Home is a gem. Worth getting service on from a competent modern shop.

Usually "bobbin" problems - a mare's nest under the fabric - is the result of improper threading of the upper thread path. I know it is counter-intuitive, just believe me.

Thread breakage every 30 seconds or so is caused by a couple of things, bad needle, needle installed properly, thread spool on its side when it is supposed to feed off the top of the spool, (like with the cross wound spools common today) or vice versa (as with the traditional straight winds).

The solution to the needle problem is to get a new one and be sure it is installed right. The wrong orientation on the thread spool can be solved with a thread stand. They are $7.00 at the local fabric store. Oh, and sometimes, even with "quality" thread, you can get a bad spool. Try a different spool before looking for a thread stand, it's cheaper.

Good Luck!