sorefingers76

Having a issue with a 335 yanimita I know that's not the correct spelling but any way I'm getting bunching skip stitches and thread breakage. But just on back sticking. Sews heat with number 69 thread I believe I'm using 135 thread and number 20 needles. For the larger thread. It'd like when I back stitch through the previous stich it affects the tension of the top thread like resistance wise. I make a bunch of leather bags and hats . But primarily leather and I have a tipman boss and I know sewing tooling leather and dryer leathers are way different than sewing chrome tan oily leathers. With a machine. I had a old Adler shoe patcher and it didn't bunch on a back stitch. If it bunched it done it all the time same as the boss. This is a new one for me any suggestions . Thanks