I'm putting on my two inner borders in one round with mitered corners. Yesterday at my sewing group I sewed them together -- but my portable machine started making a horrible racket. Machine is a sparrow so I'm calling it a chirp... The stitch was still good and I cleaned out the bobbin area but this seems to be more up top. Am going to try taking the cover off and oiling up there, but they sure don't make it easy. In the manual it says under "noisy machine" to lubricate the bobbin area and gives instructions for that but nothing else.
Always something!