Hi Roginoz,I have the swingarm locknut tool (part #07ZMA-MCAA101 in the shop manual) available for loan to forum members. This is the cylindrical spanner that is used on the swingarm to remove or replace and torque the left pivot bolt locknut.
This tool allows you to hold the 19mm allen bolt in place while setting the proper torque on the locknut. I also have a 19mm allen socket that will fit inside the locknut tool, and (thanks to ST-Traveler) a six inch long 1/2" drive extension. You'll need a torque wrench capable of 72 lb-ft. (The right side pivot bolt calls for 80 lb-ft.)
There's no cost to borrow the tool. PM me if you need it, and I'll ship it to you. Send it back with payment for my shipping costs as soon as you're finished, and I'll put it back in the tool chest until someone else needs it.
I may need to take you up on this, if it's still available. I'll know more after analyzing, and any tips you have is very welcome.
Please let me know, is available and thanks in advance! I'm in Eliot, Maine on the coast. 06 ST with 90 k miles.