Thin crate rails can be awkward to clamp. A small clamp jaw often presses hard in one spot, leaving the rail proud at one end or bruised where the metal touched the wood.
A simple fix is to keep a flat caul beside the glue and repair tools. It does not need to be fancy: a straight scrap of hardwood, plywood or clean offcut that is longer than the rail will usually do the job.
Put the caul between the clamp and the rail so pressure spreads across the whole piece. If glue is involved, add a strip of packing tape or wax paper to the caul face so it does not become part of the crate.
Before tightening, sight along the edge and feel the joint with a fingertip. Snug the clamp a little, tap the rail flush if needed, then finish with firm pressure rather than trying to crush the parts together.
The same idea helps with small display boxes, dividers and handle blocks. One flat helper piece can turn a fussy one-handed clamp job into a calmer setup with fewer dents to sand out later.
Practical takeaway: keep one clean, straight caul near the bench and use it whenever a thin rail or divider needs clamping. Spreading the pressure is often the difference between a tidy repair and a corner that needs another round of cleanup.
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