If you mean you want to close up the density of the stitching then you change the setting on the stitch length knob which would be on the right side of the machine near to the flywheel. However, if you mean you want to make a narrower stitch width wise, then this is achieved by several adjustments. Firstly, if it s a 4 thread, then unthread the left hand needle so it is only making a seam with three threads, the upper and lower loopers and right needle. Test this seam and see if it is narrow enough.
If you want it narrower, then you need to move the position of the lower cutting blade to the left so the machine is trimming closer to the needle. Test again. If the stitches are now hanging off the cut edge a bit, then tighten up the upper and lower looper thread tensions by a half number and test again. You want the threads to meet right on the cut edge so if the top looper is rolling under to the bottom then tighten it up some more (higher number) in small increments, test stitching after every adjustment.
I hope this makes sense to you. You should be able to download a manual from the Singer website, link is
http://www.singerco.com/accessories/instruction-manuals then type in just the number of your model and click "search" give the page time to build, then click on the "free download" button to bring up the pdf file, again give it time to load, its a large file. Then save to your PC.
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