In reply to riojaiv:
A short cut off bit of garden hose or car radiator hose over the point of the pick or ferule does the job...
However... if you do this (as I've done myself) because you don't have some proprietary rubber axe/pick protector for your axe. When you have it on the back of your rucksack some cable car operators get unhappy. It may be better to stop being tight like me and buy that ice axe protector rubber do-dah 😉
(Oh and don't be like those first season alpinists. Take that rucksack with the ice tools and/or crampons off your back and carry it in your hand while in the cable car please so as not to accidentally injure others).
Edit, yes get that rubber protector thing!! Just checked my right shin and I can still see the a small scar/depression from all those years ago where I tripped over my mates rucksack in Victoria coach station (London to Chamonix Eurolines coach) and fell onto my axe on my rucksack. Then terrified the driver would refuse me entry onto the coach if he saw how much blood was over my leg. Hadn't even got abroad before I picked up the first "climbing" injury 😆. The rubber do-dah would've avoided all that
Post edited at 20:10