I am thinking about scrapping my rear chuck adapter idea. I got my new rear chuck yesterday. It has internal threads and measures 1.478 I.D. My spindal on my lathe also has internal threads, it measures, 1.532. Wouldnt I be better off finding what the thread pitch are for both and making a nipple so that I could screw into both sides. My only worry would be that one side or the other may loosen up when it spinning. I already made an adapter that just slides over the o.d. of the spine, but I havnt drilled for set screws yet. Any ideas, Thanks!