Geoffrey, sorry, George,

To sell something there has to be a market. Have you ever looked at the price of the raw material you're talking about? Once you've added that into the selling price I think your market for simple cheap motor mounts disappears.

You haven't mentioned what profession you've retired from, but I'm willing to bet it wasn't engineering.
Engineering 101:
Doubling or quadrupling price must double or quadruple performance/usefulness to customer. Otherwise which fool is going to pay?!
True, plastics could be stiffer (though not measurably in this application), and they may be more dimensionally stable (measurable but not functionally important in this application), but they're not 200% stiffer and 200% more stable.
End of lesson.

If you find an exception to that rule (a fool who IS willing to pay) I suggest you don't post it in this thread, but keep it quiet and work on it. Next post should be of the Porsche you've bought with the rude profit made. :whistling:

But most people are not fools. And to those sensible folk who recognise what they're seeing, I am offering MDF motor mounts! Clicky

PS. Thanks for keeping this thread at the top of the replies list. Very helpful.
PPS. Lee, you can't. My mom has already patented them.... lol