rOtring has recently unveiled its new 800 that comes with a “+”. And this might be the most ingenious way to incorporate a rubber-thingy for tactile screens. The point of the mechanical pencil goes THROUGH the rubber. I find this as being not as goofy as most of the rubber-thingy on the top of the cap or the back of the pencil. This is just so elegant.
My pencils draw worlds 
Clever! Can you compare the inner mechanism of this 800 with a vintage 800, i. e. with one made before Newell-Rubbermaid had bought Rotring?
I have no vintage 800, and have only preordered the “+”. So I have no means to compare the two. Sorry.