How to install the sparker:

1. Find the drill bit closest in width to the shaft of the sparker.

2. Drill a hole around the middle of the end cap.

3. Un-screw the top nut and remove the washer.

4. Push the sparker into the hole from the bottom of the end cap.

5. Replace the washer and top nut and tighten both nuts.

6. Test that it creates a spark when flicked and that it doesn't intrude with the rest of the gun.