Maple platform under turntable, How thick?

Anyone used Polycrystal amp stand under turntable or tape deck?

All right. Thank you everyone. I will try Mapleshade 4" with their footers and will have brass cones for comparizon.
Over $200 for a piece of wood, oh, beg your pardon, air-dried hand-selected Amish craftsmen made piece of wood.

Under my Teres 320 I've been using a three-inch thick, two-foot square maple from Tony's Woodshop (look under multimedia storage). Its not Amish, but a few yrs ago it was ~$75 w/ shipping. The maple block sits on doubled-up corrugated-rubber-and-cork pad thingies like Mapleshade sells, but got them much cheaper, example here: http://atlantavibrationpads.com/rubberandcorkpads.aspx

Thank you. But I want Amish dried air made! Oops. I mean air dried Amish made.
I'll take a look at Tony's.

I am using a 2.5" solid maple board under my Spacedeck. It is placed on a combination of squash balls and those Mapleshade cork/rubber footers. I've put the NAS supplied board on top of this for additional isolation, which may not be necessary. Works for me. ;-}