Thanks Greg, that sounds like good advice.
I thought of using the post hole auger because that saves me a lot of digging.
But if it is mass it needs then it is mass it will have.
I read on the SB website that just bolting a pier to cement can cause vibrations if the cement is not perfectly level and the pier is not grounded properly.
SB recommended using treated ply, I don't think wood left in the elements will last very long, treated or not. I guess it would be fine in a sealed environment. here is the link
https://www.bisque.com:443/help/para...nent_piers.htm
So I was thinking of using a levelling compound, to make a perfectly flat surface.
Thanks
Phil