I bought a used Hazet 3 Wrench Valve Adjustment set before I did My first Valve adjustment.
I had to use the 3rd Wrench on 2 of the Spring Retainers. The Nuts were not suck hard on them at all.
If you look in the Manual at how the 3rd Wrench is supposed to be used; I think it is kind of an Awkward too to use.
After that on later Valve Adjustments I did not have to use the 3rd Wrench.

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84 300D, 82 Volvo 244Gl Diesel