V Slot Rail Corner Bracket with Flat Side

I needed a way to mount a cable clamp for the wire loom on my XY axis but didn't have any metal corner blocks. I just made one side flat leaving the remaining M3 hole in place. Same thing as grinding the nubs off a metal corner block.

The hole for the cable clamp was tight enough that I didn't need to add a nut. See other photos for my installation.