Seams pucker, I have increased and decreased the tension, I have changed the needle, I have lengthened and shorted the stitch width and length - none of this has helped. Any suggestions?

Sewing on double layers of leather can be challenging, and it's important to have the machine properly adjusted to handle the thickness. Here are some adjustments you can try:

1. Needle size: Make sure you are using the correct needle size for the thickness of your leather. A larger needle may be required to penetrate the layers.
2. Tension: Adjust the tension of the upper thread. If the tension is too tight, it can cause the needle to break or skip stitches. If it's too loose, the stitches may be uneven.
3. Presser foot pressure: You mentioned you have already adjusted the presser foot pressure, but to clarify, turning the adjustment screw clockwise will increase the pressure, while turning it counterclockwise will decrease it. You may need to increase the pressure for thicker materials.
4. Stitch length: Increase the stitch length for thicker materials. A shorter stitch length can cause the machine to struggle to sew through the layers.
5. Speed: Slow down the speed of the machine when sewing on thicker materials. This will help the machine to handle the thickness and prevent skipped stitches or broken needles.

If none of these adjustments work, you may need to take the machine to a professional for further inspection and repairs.

If your Huskystar 207 sewing machine is stuck on zigzag stitch even when you have selected a straight stitch pattern, there are a few things you can try to troubleshoot the issue:

1. Check the needle position: Make sure that the needle is in the center position. If it is not, you may need to adjust it using the machine's settings.
2. Check the stitch length and width: Make sure that the stitch length and width are set to the appropriate settings for a straight stitch. Refer to your manual for the correct settings.
3. Check the tension: If the tension is too loose or too tight, it can cause the machine to sew a zigzag stitch instead of a straight stitch. Make sure the tension is set correctly for the fabric you are working with.
4. Clean the machine: Sometimes, a buildup of dust and lint can cause the machine to malfunction. Try cleaning the machine, particularly the bobbin case and feed dogs, to see if this resolves the issue.

If none of these steps resolve the issue, you may need to take your machine to a professional for repair.

You should probably take it for service. The tension mechanism may need an adjustment.

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The U shaped clamp usually hooks "around" the needle screw. Yes, usually the walking foot may need oil (just a tiny bit) where the parts move against each other.

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Your tension shouldn't need changed when you change the length of the stitch. Start at C-D for a start. Use rags to test. Your stitch length is chosen by the slide handle on the bottom. By moving to the left your length of stitch will increase and opposite will decrease the length. Anyway, your tension for the fabric may need to be set with a test piece. After that your chosen length shouldn't need any change of tension.

You can try a smaller stitch length.

Check tension and threading up first, sounds like top tension or thread catching somewhere. Also have you changed the needle, i change mine for EACH new sewing project, needles go blunt and need replacing every 4-6 hours of sewing. Lastly, press seams as you go, this improves appearance and blends stitching into the fabric,

a wide zig-zag on a light weight fabric single layer is almost guaranteed to pucker up, just because the thread is under tension and this is often stronger than the fabric being pulled together by the stitches.

However, if a straight seam is puckering, this could be caused by a blunt needle, too big needle, or too tight tension or too long stitch length. You should be able to vary some of these variables to reduce the puckering and improve the stitch appearance. Other things to check might be the top thread being caught up somewhere in the thread path and pulling on the stitching.

If I am finishing the cut edge of aa single layer of light weight fabric I would use a three step zigzag to hold the fabric firmly and neatly.

Hope this helps a little?

Check the bobbin tension too. It could be too tight. Make sure you are using the right size needle for the material as well. Sheer, thin fabric needs a smaller needle, thicker material requires bigger needles. Bobbin tension is the typical problem as most think to adjust the top tension but don't check the bobbin tension.

Is your quilt peices cotton? Cotton shouldn't cause as much trouble sewing along the edge but don't use too long of a stitch length else it will seem to gather up. Puckering side to side however is a tension problem usually. With sheerer fabrics that cause a problem sometimes you can put thin paper underneath, sew through both and then pull the paper off after sewing. (thin like the iron on type interfacing type fabric but like paper).

The 1130 does not have a consumer adjustable presser foot. Check to be sure you are using the correct presser foot .Some feet are slightly different in height which is how the pressure is regulated. If this is not your problem it will need to be seen by a technician.
sewman7