Since you have what in my hand!

The fixation of the blade works quite well with the English thread on the rear handle. With practice, this is also single-handedly.

The only complaint is that there is no replacement blades can be accommodated. Bother me but less.

The fact that it is pretty hard but not annoying hard, you could insert this rugged part at any time. I do not like, if you do not notice whether you have a tool there or not because it is built so windy.
It has as I said kept the whole structure over. My other craft knife made of plastic (as everybody knows) give up gradually the spirit. In a pinch, you can sometimes use as a hammer.

Oh, and the second disadvantage is that you always have to keep an eye on it. Unobserved comes this knife into his trouser pockets of other craftsmen. Therefore, I have unfortunately not need to purchase only once it.