Easton - Universal Nock Tool
The Easton Universal Nock Tool is the tool that does it all. There are three grooves to cover all diameter nocks, one for G nocks, one for H & X nocks and one for N & S nocks, allowing you to adjust your nocks on all of your various arrows with one tool.
The Easton Universal Nock Tool also features a threaded extractor to allow you to easily remove broken nocks which folds away when not in use.