The concept is good but the engineering is wrong. The cutting heads, even if lubricated regularly, and obviously made out of metal, wear out the small plastic parts that hold them together in order to cut. After the plastic wears out the cutting heads no longer hold together and will no longer cut. It sucks but does not cut. It sucks!
Answer: I don't know what you are specifically referring to. I wrote a true review of the product and ended with "it sucks." Did you not read the review? I told you very specifically why I feel it sucks. I actually bought this product. I actually used this product over a period of time. I actually told you very clearly and specifically why the product has a problem and what the problem is. What do you really want to know, Russ D.? If you have an honest specific question, I will address it.