don't bother with the nut on the end
just turn the wheel when you've removed the brakes and they'll ping out after a few deft blows on the fronts
when yuo put them back in again tap them in witht he hammer once you've got them seated with your hands (this won't work with the rears unfortunatly) and then use an old steel wheel wheelnut to draw them tight useing the brake disc to pull them through
on the rears you'll need to knock them out and insert them with the hole at the top of the hub as there is more space there
they've got a knurlde bit ont he ends to lock them into palce so once they are tight enough (or as tight as you think they will go, you'll feel them getting tighter and tighter and then they'll get really tight when they've seated) remove the disc and visually see that they are in flush as they can go