kitchenaid stand mixer full range speed adjustments?

Is there a "trick" to properly adjusting the full range of speeds on a kitchenaid stand mixer? I have the Ultra Plus.
There are three set screws under the back cover. Two on top (spring loaded) and one on the bottom center. All three play a role in obtaining the full 10 speed range.
Aside from trial and error, is there an official procedure on how to best adjust these screws to obtain the full range?
Much thanks. MC
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