Is there a special tool for compressing the intake nipple rivet? I have always used a ball peen hammer, and supported the rivet from the inside. I have a friend (machinist) who says the he can make a tool to compress the rivet without peening. I gave him a set of Harley 45 cylinders, replacement nipple, rivet, and the goahead to make it. If there is a special tool, I would like to know of it's existence. I will post a picture of the custom-made tool, when it is finished (told him it was not high priority).