Manual for KOYO DIAL N SEW MODEL 516SS - Sewing Machines

Thread looping under your fabric is usually caused by not threading the upper tension correctly. With the presser foot lever in the UP position and tension set at 4, follow the threading guides/graphics on the top of the machine. Place the thread spool on the spool pin and secure with a thread spool cap.

https://www.ebay.com/itm/Vintage-DIAL-N-SEW-SEWING-MACHINE-model-SL-2010B/133187178498?hash=item1f02931002:g:ioIAAOSwFTBddY0p

That ebay listing is for the same machine, including a manual. I can't find a digital copy anywhere, but maybe contact the seller and see if they will sell just the manual to you, or even be willing to scan it and email you a copy? Listing is only active for 3 more days!

The upper thread is hanging up somewhere in the thread path. Try verifying the thread path and rethread from the beginning. It may also be helpful to RAISE the presser foot throughout the threading process. Otherwise, you will need to sew very slowly and watch what is happening with the top thread. You may see the thread tightening as it stitches and narrow down where the problem occurs.

if it is available then go google and type in--- owners manual ( workshop manual or operators manual) for dial-n-sew sewing machine model 580f
there will be pages with free pdf downloads

I found one site willing to let you download a user manual for $10.00
DOWNLOAD Koyo model 1201 sewing machine manual smm526pdf Machines name...

However many machines are much the same. Youtube has video's showing how to thread sewing machines. Maybe one of them is close enough to your machine that it will work.
sewing machine how to thread YouTube

sewing machine tutorial YouTube

Change the search terms for whatever you need.

Search the internet, inputting:

Manufacturer + Model + the word "Manual"

...

Try www.ismacs.net/free-sewing-machine- They did have free downloadable manuals, and I believe they are still offering them as PDF files. Does this help you out? Jimmy

Is this the duplex model with the base that fits into a sewing cabinet?

My Elna booklet lists a SP "air electronic" duplex (CL.39), if so, then it would be same stitches as the 38, yellow front panel, 7 built in stitches and automatic knob with blue markings for buttonholing.

Here is the SU manual images for buttonholing, should be exactly the same for the SP.

Instructions are:
use buttonhole foot. turn the 3 dials to buttonhole marked in blue (stitch selection, width and length).
Mark length of buttonhol on the material. Place work under foot with the mark in the middile fo the foot, the start being directly below the needle. sew the first side, raise the needle. Turn stitch width dial to 2, blue. Sew a few stitches for bartack. Raise the needle.
Turn stitch width dial to 3 blue. sew the second side. stop just short of the first side. Raise the needle.
turn the stitch width dial to 4 blue. sew a few stitches for bartack. Raise the needle.
Turn stitch width dial to "fastening off stitch" blue dot. Sew a few stitches, holding back the material by hand. Raise needle, lift pressure foot and remove work, triming off threads.
Open the buttonhole with your seam ripper (put a pin across the end to avoid any nasties).

Here's what the manual says:

Before sewing, fit the button-hold foot to the machine (long white plastic thing with red, ruler like markings).

Select the pattern selector dial that is solid green on the left hand side. Set the dial to "1" position. Sew the left side and raise the needle.

Select the pattern selector dial that is solid green on the top and bottom. Set the dial to "2" position. Sew 5-6 stitches and raise the needle.

Select the pattern selector dial that is solid green on the right hand side. Set the dial to "3" position. Sew the right side. Raise the needle.

Select the pattern selector dial that is solid green on the top and bottom. Set the dial to "4" position. Sew 5-6 stitches and raise the needle.

Hope that helps...