if imess up?
DONT USE SCREWS ! ! ! ! ! ! ! They suck, there is a better way. If you mess up using screws you will have to bend them to set the gap correctly and that sucks. Try this instead, and here's a pic to clarify. Use 10-24 x 3/4 machine bolt and nut and 3-wire house hold wiring. 1. The machine bolt can be found at any Lowes / Home Depot in packages of 2 to 100. 100 is like $8.00. 2. Use 3 wire house wiring found at any Lowes / Home Depot also but is expensive, so go anywhere a new home is being built and find some scraps, they'll be aywhere and everywhere. 3. Inside the 3 wire is a bare ground wire which you can cut to about 3" to 4". 4. Bend a loop in one end with a (4.5) plier, then bend the loop over. 5. Once the machine bolt is in the gun, just slide the loop over the bolt and put the nut over it. Repeat 3 more times (for dual ignition) These ignition posts are easily adjustable, easily removable if you feel like cleaning out your gun and are a way better conductor than any zinc plated screw. One more thing that is nice is that if your screws are messed up already, you can just change them out with the machine bolts and coper wire combo.
One more thing, here is my latest gun. 3rd pic is of the combustion chamber.
http://www.spudfiles.com/forums/viewtopic.php?t=5041&
http://www.spudfiles.com/forums/viewtopic.php?t=5041&