We carry this 1/4" Edge Finder, you will just need the 1/4" collet to use it.
They are back in stock in the store- Made Right here in the USA by a really great guy who runs a family owned shop just up the street from us.
NOTE; set your spindle speed to 2k, no higher than that! It hasnt happened yet, but if you rotate the finder faster than that, you’ll probably explode it.
Carbide 3D shop link: