Climber legality and safety.

[s_forbes]

When inspectors judge the safety of one of your mechanisms, you get different results depending on which inspector you get. Sometimes you fly through inspection with something that I don't want to stand anywhere near (2014 was a good year for this) and other times you have to spend a lot of time filing down corners that no one will ever touch.

In general, if you've made some sort of effort to make the mechanism safer by adding guards or big bright warning labels, you will have an easier time getting through inspection.