I use jasper jigs, but I might try a router buddy (never heard of them before) next. The reason why I say next is because my first jasper jig died an untimely death and the replacement cracked in the same place as soon as I screwed it to the router.
You can see the crack in the plexi if you look near the mounting hole. The old one shattered here and I figure it's just a matter of time before this one bites the bullet.