Likely that 'maximum drop' refers to how the light is supplied, and to reduce it you undo the small screw in the silver cone part, pull the wire through to whatever length you want and tighten the screw.
If you're fitting the shade it's supplied with then it ought to hold it - if not the thing is not of merchantable quality.
If you plan on fitting a different shade that weighs more than the supplied one then you're on your own..
If your concerned about it pulling through, slide a connecter block over the steel wire within the housing, that will give two extra screws.
If really worried then loop the steel wire through the connecter block twice.
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