Familiarizing myself with filter changes for 400 hour fluid change. Owner Manual has me a bit confused. On page 79 it says to tighten filter with a wrench "one turn" after contacting mounting surface but on page 83 it says to tighten filter by hand only "1/2 turn". It makes no real distinction between the two Hydraulic filters on page 83, it highlights both (HH670-37710 & HH660-36060) . On page 79 it highlights the shorter filter (HH670-37710). Am I missing something?