When I installed my Astro shaft, I had to file something for the bolt to pass through. It was just a little notch from what I remember. It only took me like 10 minutes or so to do the job.Thanks. I hear the jeep/astro steering shafts require the original spline to be notched. What exactly are we notching and what tool would one use? The input shaft is solid metal how would you go about it?