I have worked at a Yamaha Dealer now for almost 10 plus years and have never had a customer question the bottom edge of the bottom board. I have had them touched up when they have had a blemish but not had a problem after that. I have seen lots of high and low density fiber boards in my day and have found that Yamahas have never been a problem. If a piano company chooses non structural areas and uses a high density product there should not be a problem. Ed Tomlinson Tomlinson Tuning and Repair
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