There are a couple of blunt style knives that come w/adapters that can be mounted on hoses.....The adapters are for rubber hoses, they work on Miflex hoses but tend to slide...Some people wrap a piece of inner tube around the Miflex hoses to take up the difference in diameter...I wear one of the small blunt, titanium knives on the inflator hose and another on the analog SPG hose...I can reach either w/both hands....It's a stream-lined set-up and doesn't interfere w/other gear....I've also seen people mount knives on the back of their mask straps w/a DIY attachment.......