For some products you need patience, tolerance for others, for that misconstruction of a bed of nails you need HUMOR especially! As Fakir me in this device, the integrated nail bed is of course particularly important. Unfortunately, this is really disappointing so poorly constructed and arranged that one endures it with humor. It is just too soft !! Far too few nail tips, too short nails. Moreover, these all give immediately after drilling and hardly in the skin! I'm disappointed. The many (for me) less important features and special functions that have been adequately described by other reviewers and some of which were not very carefully designed by the manufacturer, I do not want to enumerate again. I've had enough with this bad design. I will send the thing back. You can find it in the Resterampe.