An SB is always an important thing and we have a big fortune that Van's give us this service.
My 8 is flying from 2010, serial 82317 (January 2007), is the one of the last QB not PP from mothership.
During the construction I put the central 8 bolts as per manual and lost the 4 external one - the worst. These are probably in my Open Item list (mind) never written
[you forget, planes don't]
Was time for acting. Not so happy to drill big holes into my upper flange, I applied my strategy.
1) make the spar hole control column passage accessible. So remove front floor completely, aileron push-pull tube bolts, spring from aileron trim, front and aft sticks.
2) In my ground adjustable rudder pedals is necessary to remove the four bolts that hold the rudder pedals to the floor (so I was able to slip the control column under them to remove it).
3) The missed bolts will go from aft to fwd (easier option).
4) I put the borescope into the hole that I had to reach with the bolt.
5) With a lot of DIY momentary tools and looking into the borescope monitor I centered all four bolts (no its not easy but doable, I had 32 to 36 F° into the hangar)
6) Applying the same DIY activity I was able to reach the bolts head with a wrench. Now using the torque wrench into the nuts was a piece of cake.
I had the opportunity to check a lot of hidden places, clean everything with deep inspection activity and I took the option to trash the brake reservoir line for two brand new Fluid Reservoir small tanks that are waiting to be installed.
Total time spent : 15 hours.
"Anything... you would have done differently if you... had to do it again? Yes. I would've done it in July" - Jeff Skiles from "Sully"