Singer 99K variants (stitch length adjustment) question
Our 99's have the backstitch feature with the round, knurled thumbnut and a red indicator to the left to show length. Screw the nut in and the lever only comes down the the set stitch length. Another style 99K has a flat metal tab but in photos(don't have this variant) I see no way the length can be locked in. Is this the case? Do you simply look to see that you are at the stitch length you want? Just wondering before we go see one some distance away that's for sale. Thanks, Don