I recently tried an old singer 771 a lady had for sale she had some 4-5 ounce chap leather there I tried sewed very easily and nice stitch on four layers she said five layers usually breaks the string, the thread size she had was 69. I am just wondering if anybody has any info on this machine such as what size thread you can sew with and what is the most you can sew with it I would be using it for chaps and hopefully headstalls if this machine will tackle that, she didn't have any firmer leather for me to try harness or skirting. just looking for info and what is this machine worth comes set up with a table and motor? thanks