Broken Bobbin Case.

I am now, once again, inbetween quilts.  I thought this would be a good time to send the sewing machine to the Fix-It Guy for an "oil change."  I was expecting to get it back on Wed.  However, I got a call from him  on Thursday, and it seems I have a broken bobbin case.  This could explain some of the trouble I had with the tension when quilting the Harry Potter quilt.  Seems a point broke off a piece in there.  I remember when I cleaned out all that dust and lint in the machine I did find a piece of gray felt (?) and when I plucked it out, it seemed to be stuck and/or half-glued down.  I wonder if it had previously been covered by something, because I didn't recall seeing it before.  Anyway, I authorized the repair ($40) and the Fix-It Guy will have to order the part, so I have no idea when my sewing machine will come home.   :(