Another way to "locate" where the 1/4 inch seams should be sewn:
I took 1/4 inch graph paper - put it under the presser foot - put the needle through one of the lines - and then looked to see where the edge of the presser foot came in relation to the needle and a quarter line mark on the paper.
I have an older Pfaff and I could move the needle left or right in small increments so I was able to use the edge of my regular presser foot as a guide.
Or in my case, I put the edge of the presser foot on a 1/4 inch line and fiddled with the needle setting until it was "correct"