When I sew on my 99K I have been noticing that it sometimes pulls the fabric colour into the stitch. This is really noticeable when I am using white thread. It doesn't affect the stitch length but looks odd. I am usually just piecing on this machine so it doesn't really matter, but it is bugging me. I have tried adjusting the tension but that doesn't do anything to fix the problem.
I love this little machine, it runs so smoothly. I bought it about 6 months ago and it was in great shape. I downloaded the manual, cleaned and oiled it. I really don't want to have to have it serviced and I figure someone here can help me out. Any tips would be welcome.