|The gap, as of the last post.|
Yesterday, I filled the gap with thickened epoxy, then forced the gap closed with some substantial clamp pressure.
|The lap joint clamped back together, as the epoxy cures. I used scrap plywood to protect the wood from the strong clamp pressure.|
After leaving it to cure for 24 hours, I removed the clamps. Thankfully, the closed gap held.
My attempt at countersinking the 1-3/4" #10 screw wasn't that great. The second attempt, on the other side of the frame was better.
Unable to leave well enough alone, I removed the screw from the first side, re-drilled the hole with a slightly larger bit, and drove a new screw through it. Much better.