I am e new member, but I was lurking a long time. I was able to find answers to my questions in this forum in the past, but this time I couldn't find, so thats my first topic.
I am planing to buy my first sewing machine to sew shoe and boot uppers. I have found two options near me both Pfaff 471, one is with letters "AL" and other "BL", from what I have found out "L" means leather "A" means lightweight materials and "B" means medium-weight materials. So my question is in which category shoe and boot uppers fall in, lightweight or medium-weight category sewing machine? By the way "AL" is newer and "BL" is older machine in the photos.