OK that's what I was looking for. I am not wild about drilling a bunch of screw in my chamber but what you are showing just 2 holes and multiple sparks in the center throughout the chamber. I bought everything for the propane meter today and going to sch 80 PVC tomorrow. After I get it built I will ...

That's what I needed to know. I am trying to make this cannon my best one yet. Learning from my past projects, I am making this one flawless. I do appreciate your help.

I like that but it is less effective than say screws. What I am really wanting to know is if screws in the chamber the best way for the most power?

I am building another cannon and I am moving up from the "spray and pray " style to a metered direct propane injection. I have seen some people use screws but I want some ideas on other ways. I am looking to try and have 3 spark points inside the combustion chamber. I am using a 12kv electric BBQ sp...