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Pemko 434ARL 24" Automatic Door Bottom with Rubber insert - Mill Finish Aluminum - Full Mortise Mount
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I agree with your installation procedure and would to the same. I might be tempted to use a 7/8" dia. 2 - flute carbide bit (or perhaps a 1" if the ADB would tolerate it) and make one pass (rather than a tool and template reposition) after finding center.
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