I need a machine that can handle wallets and guitar straps. I have been using a hand crank Singer 66 that worked ok for that but it was on loan and is going back to it's owner. The guitar straps are 4-5oz with a 2oz decorative layer stitched on top (tribal pattern, flames, band name...) then the top assembly stitched onto a liner. Wallets 4-5oz and I have been using goat to make the inside with a cloth liner. I can get a Singer 16-188 (old walking foot) machine as well but seems that a lot of boot makers like using the 31-15. I think this machine will end up with 69 thread most of the time but may go as high as 138 at times. I really would like as much input as I can get. I might be purchasing this weekend.