Ya if anyone knows a method to make them at a reasonable cost I am all ears.
Looking at my MACS pipe for the 10 to 15 size engines the stinger has thicker walls then the other end - you can tell they used Swaging machine.
The largest dia of the pipe is the constant the swaging machine spins both ends down to a given shape leaving circular marks on the metal
I had to use my buffing wheel to polish out the marks.
Last edited by Pond Skipper; 04-13-2015 at 09:04 PM.