Running the headset without the locknut (the top six sided nut) is gonna be a real pain in the ass cos there is nothing to stop it all unscrewing. You will have to hand tighten the top race (the bottom round bit that has a six sided nut on its upper part) every few minutes. It will still be always too loose and so you will knacker the races really quickly. Better get a longer fork as soon as you can.
Running the headset without the locknut (the top six sided nut) is gonna be a real pain in the ass cos there is nothing to stop it all unscrewing. You will have to hand tighten the top race (the bottom round bit that has a six sided nut on its upper part) every few minutes. It will still be always too loose and so you will knacker the races really quickly. Better get a longer fork as soon as you can.