About a month ago I came across a Singer 45K53 cylinder arm machine that has independently adjustable upper and lower feeds. It came with an illustrated parts list, but no operators manual. I'd like to learn what I can about how it operates and how it's adjusted. I've looked extensively for the manual, but no luck.. If any one is familiar with the 45K53 or has a manual, I would sure appreciate the opportunity to chat with you. Thank you, thank you very much.