Originally Posted by
dddd
I believe that widely-differing results should expected, and that everyone's contribution has made this an interesting thread.
Looking for some common ground here, my advice was
Sure, get the right tubes if you're going to buy new, but if you have a presta tube lying around it should work fine for as long as you want.
So if a guy doesn't have the perfect Schrader tube but he has a right-sized Presta tube I suggest he install it and go ride... even without the little knurled nuts with the chamfered shoulder. Be careful with putting the pump head on and off, of course (a little more careful than usual).
It might be fine forever, it might wear out faster than he'd like, but it's not going to be a catastrophe. Also - pack ANOTHER presta tube in your pack for a spare in case something normal will happen like you run over a roofing nail.
Ride now.
Shop later.