Assembly come next
Put the pieces together
To help assemble a hardboard jig, find a scrap the same thickness as the mortised workpiece. Clamp the cleats to either side of the scrap so they stand about 1/4" above the edge. Then, one at a time, glue and clamp the hardboard pieces on top of the cleats, ensuring that the opening is square to the cleats and centered on the jig's width.
For an MDF jig, glue and clamp the guides between the cleats.
Using the jigs
Clamp a workpiece with the drilled-out mortise to your bench and align the jig opening with the mortise layout lines. Clamp across the cleats to secure the jig to the workpiece. With a chisel, pare down along the guides, concentrating on keeping the back of the chisel pressed against the guides.
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