I got the Haydon lapping tool today, they didn't ship until Thursday.
It's well made, quite a piece of steel with nice bolt on handles. I lapped a set of Warne Maxima rings which are the vertical split rings, my alignment tool showed they were a little bit off, so I lapped them just for the experience even tho Warne says they don't need to be lapped, I read a thread that indicates it won't hurt them. The tool would work well on normal rings that split horizontally and you won't beat that price for a quality tool, but lapping vertical split rings is a pain.
Tim
Lapping Warne Rings