Modular Grinding Angle Guide

This is a spinoff of my individual grinding angle guides for an 8" bench grinder (http://www.thingiverse.com/thing:2032929). I thought it'd be neat to have a single unit that could index to each angle. So this is what I came up with.

It works, but it's got it's problems. I think the base guide needs to be attached to the wheel guide somehow, maybe a living hinge would be just the ticket.

Also, the pegs that index into the wheel guide are very small and need to be beefed up, or reinfor