Henrik Tjærby of Denmark attaches a V-block to the base of his Domino joiner, and uses the set-up to cut slots on the mitre corner joints. I found that with a bit of practice, the same could be done freehand using the sight gauge on the fence to position the machine with the mitre line. I used a chisel to square the ends. Dead-on mitres for these trays were cut on the Kapex (which was fine-tuned using Gary Katz's four-cut(?) method for square cuts upon purchase).