Oh my another problem I have, but then there are so many. I have been trying for at least 8+ yrs to get that scant 1/4" but so far haven't figured it out. I have marked and moved and even cut bigger. Nothing works for me. One of my problems to and I don't know if it is yours also but I can't sew a straight line for anything. I am sure that would help with the accuracy. That I have worked harder on than the seam allowance lol.. Oh well.
Rita