Blackberry

I have an original hand crank and it seems to be working just fine and makes a nice stitch. However, whenever I start to sew a seam the it wants to pull to the right. Now I know that I have to guide the material but this just seems to want to pull to much to the right and I can't keep it straight with one hand while I hand crank with the other. Maybe someone on this wonderful, full of knowledge, board can help me.