Here I've removed the end cap with the drilled hole to insert the center rod. Note that for this to work properly you much wrap your head around one strong fact. Air through the center tube that creates the GEET gas must flow contrary to the exhaust gases. In this case the rod's rounded end is inserted into the center tube first with the concave end going in last since this is the area where the GEET gases will exit the chamber. This steel spring that follows in behind the center rod will hold it in place. I'm not suppose to use a steel spring, but having never found a suitable stainless steel one locally, this will do for now. Later I will replace it with something better.

Previous Picture

Next Picture