I've beeing using this end cutters.
Now I have grips with a clean cut to install bar ends or handguards.
https://farm2.staticflickr.com/1619/...f728567cdc.jpg
https://farm2.staticflickr.com/1530/...3eb7e48f86.jpg
https://farm2.staticflickr.com/1644/...0d8c618396.jpg