Have a look at "Using a mousse can motor mount muffler" at http://home.wanadoo.nl/pereivers/cad.../cadviews.html ; It points to the viewer version http://home.wanadoo.nl/pereivers/cad...ssemuffle.html on my web CAD section This uses grommets and spacer bushings. Also look at http://home.wanadoo.nl/pereivers/STinstall-2.jpg . I use this backplate mounting method on all my engines from .10 (3 grommets) to 2.15 (4 grommets), and plan to use it on even larger engines like 3.60 using 6 grommets.