Next we'll have these same people telling us they change their own cassettes but never bought a chain whip because hey, it's easy to just jam a screwdriver in between the cogs and a spoke to keep it from turning, so who needs a stinkin chain whip? And who needs the cassette lockring driver when you can just expand the jaws of a set of needlenose plier (the same pliers they use to tighten nuts on bolts because they refuse to buy wrenches or sockets) and insert the tips into a couple of the little slots in the lockring, then twist.