Duane, I don't have a manual, but it's a pretty straight forward threading machine. I've heard the needle on 15s thread from the right - this one is definitely from the left. Parts?? I don't know, but as far as accessories, yes, they are interchangeable. Almost any short shank ones will fit. There's no reason the clone won't hold up as well as the 15 - I've also heard they made be better made, but I have no 15 for comparison.