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Ensure that the drifting shelf will certainly fit the cleat exactly, hold the shelf up to the cleat and also do a dry fit one that doesn't involve glue or screws. Make any modifications to fit as necessary. When you are certain the fit is accurate, apply wood glue to the top of the cleat, and after that fit the rack over it. Secure the shelf to the cleat using brads nailed in from the top of the rack down into the cleat.