I blew out the back side of two of my mortises on a box project and having trouble with the repair. The side of the box is thin and leaves me with about a 1/16th between the mortise and the inside. I used a backer board for support when chopping but the repairs keep splitting at the glue. I'm basically gluing in a peice to fill part of the mortise and chopping it back out. I included a pic of a broken and a successful one to give yall an idea of what I'm dealing with here. Any advice on how to repair this? I'm about to go with some filler and then chop that out I'm so frustrated.
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