Hi everyone. I recently obtained a Singer 45K68 and have just got to the point of trying it out but I am seeking advice on a couple of things. The first is how to thread it to create top stitch tension. I'll hopefully post a photo or two but in essence this machine does not have the lower tension arrangement.  I don't mean its missing, it just seems to never had one fitted in the first place.  I have got it to stitch but only by tightening the thread spool down on its sprung hubs but am sur