Fitting inner tube - what to do with the nut?

Hi guys,
Got a puncture, went to replace the inner tube, opened the box with the new inner tube (a specialized presta 700x28-38 jobbie) and there was a screw on the valve.
Is this necessary? If so what side of the rim does it belong (i.e. on the outside next to the cap or the inside next to the rubber/valve).
Thanks,
James.
Edit: I meant there was a nut on the valve, not a screw. I have now fitted it without.
Got a puncture, went to replace the inner tube, opened the box with the new inner tube (a specialized presta 700x28-38 jobbie) and there was a screw on the valve.
Is this necessary? If so what side of the rim does it belong (i.e. on the outside next to the cap or the inside next to the rubber/valve).
Thanks,
James.
Edit: I meant there was a nut on the valve, not a screw. I have now fitted it without.
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When I used to race super motards we binned them for exactly the same reason.
That is what I meant in a roundabout way, same conclusion..a puncture.
Nope not me mate, I'm slow and Old, I just mention that when I used to race both Bikes and Motor bikes that that was the reason why everyone recommended not to use a collar.
I wish I did have the power, it would make it easier on those damn hills :shock:
re-punctured by damaging the valve once years ago in the middle of nowhere.....its stayed with me since!
this only relates to hand pump though and has no bearing on track pump due to lack of lateral movement of pump head.
Great club in and around the Warrington area.
I also left the valve nuts off on my trials motor cycles for the reasons stated above by 'Slow and old' (me too!). But riding a motorcycle with 4 to 6 psi in the tyre is rather different from a pedal cycle running at 100psi. I can't see there being in any tyre creep there. In any case we used to fix the tyres to the rims with special security bolts - just one on a solo but up to three on a sidecar outfit. Made it a censored to change the tyre. I think trials car drivers screw self tapping screws into the tyre bead through the rim to do a similar job.
Geoff
I always fit valve stem nut also, never had a problem with valve being ripped off.