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I would suggest these which are designed to cut the housings and cables with minimum fraying. You can get cheaper ones than this.
http://www.halfords.com/webapp/wcs/stores/servlet/product_storeId_10001_catalogId_10151_categoryId_242558_productId_952721_langId_-1?istCompanyId=b8708c57-7a02-4cf6-b2c0-dc36b54a327e&istItemId=xwiriltmr&istBid=tztx&_$$ja=cgid:5302137724|tsid:35522|cid:119462284|lid:18283950120|nw:search|crid:21270118204|dvc:c|adp:1o3|bku:1&gclid=CO7XivKYkrsCFQkEwwodRxAA4A
http://www.halfords.com/webapp/wcs/stores/servlet/product_storeId_10001_catalogId_10151_categoryId_242558_productId_952721_langId_-1?istCompanyId=b8708c57-7a02-4cf6-b2c0-dc36b54a327e&istItemId=xwiriltmr&istBid=tztx&_$$ja=cgid:5302137724|tsid:35522|cid:119462284|lid:18283950120|nw:search|crid:21270118204|dvc:c|adp:1o3|bku:1&gclid=CO7XivKYkrsCFQkEwwodRxAA4A