Real wheel but torque setting & correct chain sag and where to measure

[Bretty]

I have the impression a lot of people disregard the manual and torque ratings when working on their bikes.  :rolleyes
Something to be very weary of when buying a new bike!! When someone tells you they've done a lot of work themselves,  :eek ask to see their torque wrench! 

Things like the rear axle for example, if you overtighten it, it destorts the box section of the rear swing arm! the previous owner of my bandit had done that, making it not pretty or easy to adjust in future.