RE: Levelling bookcases

["Randall" <tr3driver@ca.rr.com>]

> I need 
> something that will "disappear" under the doubled up 1x 
> supports of the bookcases.  
> Softwood shims are too soft and are wider than what they need 
> to support. Any idea what would work here?

An oddball suggestion : Why not trim the bookcases to match the floor ?
Shim them up temporarily, then use a pencil & spacer block to mark the edge
up from the floor and trim away the excess wood.

Randall