Originally Posted by pinetar
metal > wood
Mmm, I beg to differ. I've used a block of wood for quite some time, never has it failed me. I suspect many other people would say the same (pun intended!). Metal will scratch and mar the undercarriage, wood will not.
I agree the best is probably the aluminum block made specific for the application, but the wood block would by far be the cheapest and easiest solution.