THe design of these pens is not to clever to say the least. The nib section is wide in relation to other pens. If you turn these between centres, which is the only way for this pen in my opinion, you can still get what appears to be non concentric turned barrels as the nib section is cheap! The method of assembly, if memory serves me right, of the twist mechanism is very tight and you only have one chance to get it right. When you do manage to get it right its a crap pen anyway and in my opinion not very popular anyway, It's clumsy, too short for a man, too thick for a woman and would probably serve life better, providing you could afix the hook, as a fishing lure, now there's a possibility for a competition, first mackerel caught with a Polaris lure.