Ran into a problem with the lawn tractor rubber. Just a little too small for my purposes. Purchase a larger rubber inner tube from the local motorcycle shop that's just right. The rubber diameter is 4" and the mount diameter is 4 5/8"....slight stretch putting the rubber in tension, but not so much as to make it stiff. It feels just right actually

Have the mount installed on my bench top and am just about ready to run the beastie. No nose ring yet but the rubber components are here already so I just need to build the thing. Prop is a zdz 20x10 for break in, zdz 20x12 after break in. It will be interesting how much noise the intake will generate since it is practically inside the doughnut

MattK