@bkay just a thought for you, many older Singers with stitch length levers are usually near enough when the lever bar is placed level with the relevant number and "not" the lever clamp that some use a pointer. Think FW & model 15-91 levers....they are calibrated in the same way (approx. at the top of the lever bar) as they don't use the same lever clamp style to lock the lever. I think that may be all it is and your machine isn't as off as you think. Just a characteristic of yesteryear on some old Singers maybe
