T nuts for sure, replacing the "traditional" leg plates, with locating dowels as Yamaha uses. You've got the keybed out, so you've got a perfect opportunity for this operation. Use a 3/8 or 7/16 bolt. This is a more mover- safe and friendly means of securing legs. I've used it several times with lyres too. Sure beats lying upside down struggling with lyre and braces and trapwork! Ralph Thorn
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