As I remember the isolastic tube through my cradle was straight through. That's with everything out. I put the new donuts and spacers in like the drawings for the 71 on the OB site. Mine didn't have the circlips on the spacers so I got new ones. Now if you pull the long stud out, you risk dropping one of the spacers and you may have a hard time getting it lined up again. If I pull out that long stud, I always push through a 1/2" carriage bolt to make sure the spacers are all still lined up. Same on the front, use a long 1/2" bolt as a chaser. If you get the Hemmings vernier adjuster, nothing inside the isolastics change. The Norvil and the MKwhatever vernier are different and even different from each other I think.
Dave
69S