My bench top is just dropped down over the tenons cut on top of the legs into some rather loose mortices in the underside of the top. My top is 2 1/4 inch thick Ash and is 5 ft long by 24 inches wide. I have never noticed it being either loose or moving around during use. I have never felt the need to secure it to the crossbraces with lag bolts.
Similar to what Pat had done, the legs are mortised into the top, but like Eric, there is a stretcher running front to back and one slotted lag bolt in the middle of the stretcher. In theory, I could remove the lag screws and simply lift the top off. No issues with racking. Bench is 7' long, 23 1/4" wide, 3 1/4 thick top.
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Last edited by Joe A Faulkner; 10-10-2017 at 10:07 PM.