In the "Misc Info" (in this forum) there is a pretty good written description on tensioning the rotary magazine. It's the eighth post down by Rick99:
http://www.24hourcampfire.com/ubbthreads/ubbthreads.php/topics/535525/Misc_Good_Info#Post535525I received the DVD on Disassembly/Reassembly of the Savage 99 and it has a very good section on the magazine. When reinserting the rotor assembly, he points out to keep the main spine of the rotor pointing up. Using a modified screwdriver (for the bolt head at the front of the rotor) to hold the spindle head stationary, turn the rotor one, full turn and reinsert the screw in the side of the receiver. Of course, if that full turn is too much or little tension, you can adjust by pulling the screw out and using one of the other "notches" in the head of the rotor spindle designed for that purpose. Using the next notch on either side, for more tension or for less, would probably be the right one. What he doesn;t show is taking the front "cap" off of the rotor spindle. There is a tensioning spring in there that surely might be very tricky to get back together properly...I'm guessing.
In a YouTube video I watched (the gunsmith up in Maine - everyone's seen it), he recommends not taking the rotary magazine apart because it's tricky to get back together. I'm supposing he just didn;t want to go that far in his video, rather than it being so tricky or difficult.
Now, I haven;t had either of my rifle's magazines apart yet but, after watching this DVD, there isn't any doubt in my mind that you (or I) couldn;t fiddle it back together again....and do it properly.