Anybody with 20" BBS wheels on their Viper? help needed

[RX VIPER]

I've got a car with the Detroit 20" BBS wheels. I'm able to use the adapter to check the tire pressure on 3 of the 4 wheels. The 4th wheel has stripped threads in the nut. I have the accessory kit that came with the car that includes 2 screws. I'm able to use a screw driver and get the screw thru the nut with the pressure valve, but the adapter will not screw in. Any suggestions?

Not only can I not check the tire pressure, I also can't add any air if needed.