This "groove-seated" design allows the wood to expand and contract slightly with humidity without warping the main cabinet structure.
While Part 8 itself has no hardware, you should ensure it is fully seated in the groove before tightening the cam locks on the connecting side pieces to ensure a flush fit.
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By vevor
No, Part 8 does not connect to other parts with screws or cam locks. It is a structural back panel designed to be a "floating" piece held in place by the surrounding frame.
It functions as a slide-in panel that fits securely into the pre-cut grooves of the side panels (Part 4) and the bottom base.
The panel is physically locked into position once the top counter or rear stretchers are tightened with cam locks, compressing the frame around it.
By vevor