A nit: the problem with the design is that real magnifying glasses of this type almost always comprise a thin band with a break through the screw (you fit the band around the lens, close it, and then screw on the handle to hold the lens in place). I am familiar with the design as only a kid who owned one and assembled and disassembled it thousands of times can be. :smile:
It would be possible to make a magnifying glass like this, but very difficult and probably expensive — I've certainly never seen anything like this.