This page shows one way to attach the cheiroballistra handle to the slider in a way that removes the need for metal reinforcement plates and makes most use of the components involved. This also means that the relatively obscure description of the triggering mechanism had to be deprecated in favor of good design choices. For further discussion on this subject, refer to the cheiroballistra triggering mechanism page.
Process step-by-step Edit
First make sure you've attached the fork, claw and trigger to the slider and that they work as intended. Then mark the place of handle's slot, as well as it's axle to the slider. Make sure the handle axle is as far away from the end of the slider as possible; this helps prevent the wood from splitting.
Now, following the marking, chisel the slot. It should end up looking like a ramp that descends towards the handle axle:
Chisel until the handle fits into the slot perfectly:
Drill the hole for the handle axle:
Verify that the handle can move up and down freely and if not, chisel some more or file the handle as needed:
Next drill two holes for the pitarion into the slider and push it through them. In this design, it's purpose is to reduce the chances of the end of the slider splitting:
If the legs of the pitarion are thin enough, you can now bend then into a shallow groove chiseled to the bottom of the slider. If they're thick, just cut away the excess:
Next we need to mark the place for the handle's anchor on the case:
Once the place is marked, drill a hole to the case and hammer a strong, round bar into it. Optimally, the handle will snap into the bar tightly when slider is fully retracted. In other words, the slider should not be able to move forward when the stomach pressure is released.