Test-assemble the side frames. If a joint is too tight, disassemble the pieces and use a chisel to pare away some wood. Once you are satisfied with the fit, sand any surfaces that will be difficult to reach when the frame has been glued up, and spread adhesive on all the contacting surfaces of the rails and stiles. Do not apply any glue in the panel grooves; the panels must be free to move within the frame. Set one of the stile pairs on a work surface, fit the rail tenons into their mortises, then slip the frames into their grooves (left), tapping them into position with a mallet, if necessary. Fit the opposite stile pair on the rails and clamp the frame (step 2).
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