SRAM X-9 missing adjustment screw?
I noticed when cleaning my bike I lost one of the High/Low screws. Should I be worried?
But even a lousy downhill run is better than a day in the office!
Which one are you missing? If it is the low limit screw I would be worried about over shifting in to the spokes and jamming up the rear wheel. Not good. If it's the high screw, overshifting wouldn't be so catastrophic.
Either way I would go get a replacement. Certainly not an expensive part