Singer 99-13 sewing only large stitch length & now the wheel & needle won't move
I am new on here & new to trouble shooting vintage sewing machines. I am working on a Singer 99-13. I have cleaned, oiled, etc. I have only been able to sew large stitches. I have tried turning the grey screw left & right. It does not change the length of the stitches. I have changed thread & needle with nothing changing. After I wound a bobbin so that the top and bottom threads were the same I tried again to sew. Now I have another problem. My wheel & needle will not turn. I then took out the bobbin & case, cleaned & oiled. Nothing changed. My one problem turned into two problems. All help will be so appreciated. I was going to post pictures but there doesn't seem to be a link to it.