For the life of me, I can not get decent looking stitches out of the machines I have. I have read all the topics here, and even went so far as to ship my Techsew 4100 all the way back to Canada for Mike and Ron to adjust for me. When they sent it back it was great for one material and lining, but anytime I chose to sew something else with a different thread, needle, etc it would never be the same. I have good quality thread so that's not the issue, but especially black seems to be the worst. My machines are the above stated Techsew 4100, and a Bogle import like the Techsew 2700.
On the 4100, I am using a #4 braided thread on the top, and 277 in the bobbin sewing with a 7x230 chisel point needle.
And this is through 2 layers of 8-9
Lets deal with the 4100 issues, and then I'll seek y'alls help on the 2700. Thanks in advance. I am a long time leatherworker, but new to machines above a Singer class 15.