I've never used anything but friction to retain the hose and in 20+ years of using pneumatic retracts it has not been an issue. Just be sure you always keep fresh hose on the nipple. In other words, if you remove the hose for any reason always cut it back to make sure you have fresh, unstretched hose going back on the nipple. It doesn't hurt to change out your air lines every decade or so too!
