killadoe
You can got to Wal-mart or any drug store and get "finger cots" or what I use a comercial product called "muzzle mitts." They are more expensive than the finger cots but are also a little thicker and hold up better...
http://www.basspro.com/webapp/wcs/stores/servlet/ProductDisplay?storeId=10151&catalogId=10001&a mp;langId=-1&partNumber=19942&hvarTarget=search&c mCat=SearchResults
But, a lot of people use the simple old black tape...