Hello All- I am brand new to this forum. A few years ago, I purchased a large bag of leather scraps at a yard sale. Later I found a leather sewing awl. Since then, I have been repairing horse tack, making western holsters and knife sheaths by hand. I recently bought a Singer 29K-51 machine that needs some work to again function. I am unclear on the differences between the 29-4, and the 29K variants. Will the parts and service manuals for the 29-4 give me good numbers and service info for my 29K? Will my machine sew three layers of 8 oz leather? What size needle and thread? What type thread? I know that my questions are elementary, but that is where I am right now. Also, my bag of leather scraps is about gone. What type of leather should I be using, and where should I get it without paying for the steaks and hamburger too? Thanks for your patience and willingness to help a rookie. Regards, Clark