RE: Sound proofing
Yup, I should have thought of that question, fastening.
I originally used the aluminum pins which you then press the foam over and nice domed clips and washers to secure the foam. Nice but it got expensive.
I now use a flat head #6 x 1.5" screw with a LARGE 1/4 fender washer and a smaller flat washer which catches the screw head and the fender washer. Does a fine job and a lot less expensive.
I chose the lenght of the screw to secure the foam without penetrating the cabin sole.
I was leery of the glue particularily over top of the engine.
There are plastic pin and washer setups that I have seen and used a few of but I'm mostly done now. The racket is down to a level I can live with and we can talk over easily.
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