If the tapers are too long, just snip them off as lpc suggests. If they're too short, and/or the taper angle is off a bit, you have a problem. Only way to solve it is to regrind them. If it's real close, you might be able to hold the nock in place while the glue dries. However, the glue has a tendency to melt the nocks, particularly Bohning fletch tite. Just a little too much pressure one way or the other in the first 30 seconds to a minute and you've got a crooked mounted nock. Good luck.