Hatsan AT44-10 5 screw mod failure.

Help. The valve body broke in half along the area weakened by the set screws and enlarged port hole while firing.
I cleaned out as much debris as I could but something is preventing the bolt lever from cocking the gun. Without the lever all the way back I can't remove the magazine. That means I can't get to the front screw holding the receiver to the hammer tube. The lever goes back to where it just starts to engage the hammer and moves it back about a quarter inch. I believe I've had trouble getting the lever all the way back before and so it might not even be related to the broken valve body.
Any ideas for dismantling the gun? I feel like I'm the one that's screwed.