I am so far moved my cornea with a slicer with blade to the body, very efficient, but the risk of injury is immense. I will continue to use the part, but not to the bitter end, because of the fine-tuning with the AEG PHE 5642 works great. Who expects to order cm-thick corneal ablation will be disappointed, but it is not made. Super I find the 4 wheels, because a woman needs not equal replacement. The price is unbeatable, thumbs up.