One can create their own book using Wt. ratings points e.g.100 Pts ect.as shown on UniTAB ,or place or win percentage, by using the tool in the site shown below.

Framing a market.

http://www.ozracetools.com/index.php

Also on this site one can reframe the market by using the newspaper prices & convert it to a 130% market for the whole field, this will usually get close to the final win dividend.
From there one can take out the six horses with the relevant prices.

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Cheers.