I used some stainless steel screws, and screwed them up into the wood through some of the mesh plastic bases that are used for an under gravel filter system.

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Mike
1983 Mercedes-Benz 300SD 270K
1960 Ford F250 62K
1990 Mazda Miata 156k

The thing is Bob, it's not that I'm lazy, it's that I just don't care.