I used to simply use my eraser straight out of the box and it took me WAY too long to realize I could alter the eraser to suit my needs. So I began slicing my erasers to make them smaller and more accurate.
The only thing is.. I noticed that the white vinyl erasers were kind of .. wiggly? Smooshy? Flaccid?
Enter the binder clip! You just load that little eraser into the clip and let just the tip of the eraser exposed. Boom! Problem solved.. no more flaccid eraser!
And you can use different sized clips for different sized erasers.. AND they have the added benefit of being magnetic! (And you know I LOVE magnets!)