Hail the 29k58,also anowner/user. On the handle that raises the needle foot, to the right hand side there is a wing nut that is fixed to a height adjuster, H M L, when stitching thicker leather move this to H, and so on depending on material thickness, H should be able to stitch up to half inch thick. Also the leather belt can be moved between small wheel and large wheel, small wheel a top for heavy work, large wheel for light work, hope this helps.