I do a lot of woodturning and that means having a quick method for marking the center of a blank. I made several shop-made versions, like the one you see here. All you need are a couple of metal angle braces and cyanoacrylate adhesive like Krazy Glue.
I use a plastic 45° drafting square to align the braces. It’s important that the outside edge of the top brace aligns with the inside and outside corners of the bottom brace. I used locking pliers to hold them while the glue sets.
