Rcc619 Report post Posted January 12, 2023 Hi guys, I have search for my answer but have had no luck so I will throw it out there. I have a Cobra 4 and I am sewing with bonded nylon with 277 top and 207 bottom. I am using size 25 diamond tip needles because they came with my machine. Seems to work ok but I do have some dropped stiches where the thread seems to get caught up on the leather. Could it be that I am using the wrong size needles? Quote Share this post Link to post Share on other sites
kgg Report post Posted January 13, 2023 17 hours ago, Rcc619 said: Seems to work ok but I do have some dropped stiches where the thread seems to get caught up on the leather. Could it be that I am using the wrong size needles? I think you should move up a needle size as the top thread loop isn't being properly formed and the hook is not catching it. Sometimes you need to move up a size or two depending on the how thick / tough / sticky the material is. A good chart for thread size to needle size: https://www.tolindsewmach.com/thread-chart.html I do have a question why are you not using the same size of thread in the bobbin as the top thread?? kgg Quote Share this post Link to post Share on other sites
Northmount Report post Posted January 13, 2023 @Rcc619 moved your post to leather sewing machines Quote Share this post Link to post Share on other sites
