What I do / did with my Africa Twin's rear shock was tomake sure there was no pressure on the shock from the tyre but lifitn the bike up or placing on main stand if you have one, then loosen the top locking ring with a drift. Spray some releasing oil such as GT85 or WD40 or whatever you have down under
Let it soak in for a while, then grab the shock spring with your hand from underneath or behind the frame post, rotate the spring by hand, clockwise will add preload to the spring because the bottom ring should turn as you turn the spring
Takes about 5 minutes. Done this for years before I upgraded the shocks
The C-Spanner is meant to be used once the shock has been removed
Hope this helps as it has with many others
PS - if you're going the other way (softening or lowering) you need to use a drift or remove the shock altogether
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