I had heard that the newer motion machines had adjusted for the metal screw and nut on the coil, so for all these years I never fooled with my Silver umax. Since my Royal Sabre was the older machine, I tried it and found some improvement. Finally, today I could resist the urge no longer and changed mine on the Silver. I noticed that the nails and iron gave more of a noticeable click, giving me the idea that I reduced the masking somewhat-also, tiny objects like small brads and teeny charms came in clearer, and the smallest pieces of foil "clicked" a bit more. Finally, the depth seemed better, although the 6-7" coins were more like a whisper.