Most good archery stores stock a handy little tool called a feather stripper , works with vanes as well . Its a angled piece with a replaceable blade that slips along the shaft with zero chance of damaging it as with a knife . I know it adds expence but when you refletch carbon arrows use arrow wraps , saves a lot of hassle . I also use fletching tape , greatest invention ever in archery in my veiw . I have no problems with the fletch coming adrift on my carbons and the shaft stays clean and glue free . I switched to tape as I also use crested wood arrows and refletching them was a chore as it involved refinishing the shaft , with tape , no drip , no mess a bit fiddly but still quicker than glue .
regards Jacko