The stand off's will work if you have aluminum stand off's and the aluminum plate for the stand off's to sit
on, this keeps the firewall from compressing. The problem that I have had using wood spacers
is the wood will compress and the bolts will loosen up. When you tighten them up
you can change the thrust in the motor. I have shown Keith the set up on my plane
and he liked it because there is no way you can warp the motor mount because of the
plate on the firewall. ( one other Pic I forgot this keeps the firewall from compressing)
Hope this helps