CONCRETE BLOCKS!! 
You guys are brave, use something solid like 4" or 6" x 12 blocks of wood. You'd be surprised how easy it is to break a concrete block once it has a small facture in it. BE SAFE, sorry to be a party pooper. For 20.00 you could get 4- 6"x12" x 2' blocks cut from a lumber yard.
Rick
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Rick
'76 Carrera 3.0, track
'77 3.2 targa, back home
'95 993 C4 M030, SOLD
PCA San Diego
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