Take a look at the info on Wisner's site, regarding how many variations there are.
Pull the guts out and make sure the parts, if marked, are marked for .22, rather than .25 or .32. I have seen both levers and breech blocks so marked.
There are multiple designs of levers, and links, with various thicknesses of links out there. Then there are levers with and without a spring loaded plunger to slow down the onset of droopy levers from the action shooting loose... Etc.
In other words, don't expect parts from another gun to swap in, unless you measure them first.Remember always, that there is no locking mechanism, the breech block is simply held in place by the cross pin, rather than being wedged against a shoulder like a 'real' gun.
They will flex, as the screw is unsupported on either side of the breech block and lever (the other screw that shares the load) and while you may get away with shooting modern High Velocity ammo, it will sooner or later start splitting cases. The gasses typically rise straight up in line with the breech face, but may also follow the firing pin back. Wear glasses!
Do try to keep in mind that clean, unworn examples, seldom seem to get broken down for parts. Used parts may or may not actually be better than what you have.
Also keep in mind that there was considerable hand fitting involved at the factory, where if it did not work, they had a bin full of other parts to swap around.
They are neat little guns. I was fascinated by them for a while, then I started to understand their, and their larger cousin the Model 44, limitations. Have had a fair few of them, mostly not <cough> pristine examples.
They were built cheap, to be sold cheap, to be used up in the process.
If you end up making parts, pay particular attention to the fit of the through holes on their pins, to be as close as possible. It is generally wear on the holes and pins, as well as damage to the two main screws, that causes problems.