I recently installed the FBO plate,very easy. How accurate? Haven't tested yet. In the past I've also welded them. How accurate is that without a distributor machine? Try doing the math to figure it out. I would say its way more inaccurate to weld. It's trial and error, weld/grind. At least with the plate you can just move it. I'm assuming FBO researched the math before it was made.
Doug