well, actually, this procedure is quite complicated
first off, you need two things; 1. your bars and 2. you barends
secondly you'll want to make some room because this may require some physical activity
then after you have enough room in which to maneuveur you find the approptiate tools
these tools consist of a hammer and your god damnn common sense
now after the preparations are complete, place the smaller end, yes the SMALLER end of the plastic thingy into the hole that is in the end of your bars. it is imperitive that you put the small end toward the hole or else this will not work
begin to pound on the extruding part of the barend and it will begin to slide in
make sure you dont hit yourself with the hammer cause if you're stupid enough to make a thread like this then you are certainly capable of hitting yourself with a hammer
when the barend is succesfully pressed into the bar, go back and redo the same procedure on the other end
when you are done punch yourself in the face and ask yourself, "why the fuckk wasnt i smart enough to figure this out for myself?"