I will not be writing about the aesthetics and desing. let's concentrate on the mechanical nuances wheellock.
proper functioning of your strength springs and fasteners geometry is the basis of mechanism wheellock.
mechanism on the outside, you are using a lot of abbreviations and error, You show pictures of the interior mechanism, I on the basis of the photograph - I'll try to explain the problem.
when you understand the principle, you will not need plans to build enough you just photography!