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I've reviewed the specification for the Gill Athletics 44421 Blanking Board Assembly. This document details the assembly components, which include a leveling base board and a backer board, as well as the steps required for installation, you will need to apply a 1/2" track surface and use provided screws. I'm ready to answer your questions about this product.
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What does the 44421 consist of?
What is the installer required to do?
How do you fasten the surfaced backer board to the base board?