This part here is a failure and bad design through and through: Besides the fact that it has gone to me after 6 months break, with the same problem as with many other buyers, namely that the small pin that connects the drive to the cutting head easily fall out and the machine cuts no hair, it is also designed impractical. The tines are much too narrow to stay quickly hang on irregularities in the scalp, which sometimes also hurt. I shave my skull without comb, I need maximum brevity. Unfortunately, I have the machine then hold on to the guide groove of the comb, which is really uncomfortable and not always safe. Finally I find the rubberized surface on the side unfavorable in terms of cleaning. Here one must almost always go over it with water, otherwise fine hairs sticking. All in all, so do not even recommend the machine. And because it was so bad I did not even have it repaired, but Philips still given a chance (after all, I was otherwise always satisfied with their clippers) and bought the HC7450 / 80. Currently the only 4 euros more expensive, but can be easily touched, does not have as large tines, can be cleaned easily and the cutting performance is top. If she also holds still long, I am more than satisfied.