Wow! $70.00 for the jig to drill that hole. There is no reason you couldn't drill it yourself without the jig. Careful set up, clamp in a drill press vise, center punch, center drill and finish drill. I don't know if I will ever convert any of my guns, but it is a possibility. One thing to consider.....many years ago, I bought a Ruger OA, hadn't been shot for a while. Every 3-4 cycles of the action and the gun would lock up tight. I would have to take the cylinder out and replace it before it would do the same thing. I took the gun down and carefully lubed it, then noticed the coil hand spring was hanging up. Lots of black powder fouling in the spring hole, spring and plunger. Took it all apart, cleaned everything good and put the gun back together. Problem solved! So if you do this modification, pay attention to that area.