It does not seem possible to use the spacer rings to adjust the lens at the long end. There are only two sets of spacer rings in the lens, one set behind the first lens group, and one set in front of the lens mount.
The first set of spacer rings can be seen in the figure above marked with 1K160-756 to 760. It is not very easy to read, but it is the 8th item from the top left. In the figure below it is marked with number 94, the 3rd number from the top left. The second set of spacers is marked with 1K161-160 to 168 (or 178) in the figure above,and it is the 4th item from the bottom left. It is marked with 97 in the figure below, and is the 5th number from the bottom right. Item 1K161-178 is also marked as 97 below, but I haven't found it in the figure above yet. Under the pictures is a copy of the page from the parts list where they are listed.
Here are some links that I found very useful on how to clean/repair this lens:
Mikeno62 at Youtube. Please give this guy a thumbs up if you like the video, I think it is very well deserved.
DIY extravaganza on Youtube, also great work: