Bonneville America Forums Forums Technical Forums General Tech Rear Suspension Preload Adjustment Tool?

Hi All,
I just swapped in my two SV1000S sports bikes for an America.
I'd like to adjust the preload, I've got something that will fit in the appropriate hole, but just how much pullin' and shovin' do you need to do to adjust the suspension. Is there a technique??
Thanks in advance
A Triumph Noob