I thought there was probably more to it than I first imagined, but I had not thought of the piece on edge either. Those wheels will be very complicated to make the first dozen, after that it probably is just down to difficult. I think that the wheels with the leather at 1cm thick, they re likely two or three layers thick. In my mind I had thought a layer of stiff felt and a layer of leather and all was going to be good. I am still going to put a layer of leather on my MDF wheels similar to Wolfpack. My deep thought is more on the machine running the smaller wheels like 2". That does not give a guy much for finger space.