That screw is for locking the twist module.
To flash the joystick for the new grip do the following:
1. Download
the configurator;
2. Download
the bootloader;
3. Download
the firmware package;
4. Unzip all the 3 files in the same folder;
5. Launch VKBDevCfg as Admin and click the Bootloader button under Tools tab;
6. Navigate to the firmware file folder and load up the file called _BlackBox_GF_MCG_Ultimate_Twist_v2_09_9.vkb;
7. After the bootloader finishes the flashing process launch VKBDevCfg and click the Default button under Tools tab;
8. Go to Test/Axes1 tab and click on the Start Calibr button;
9. Move your pitch, roll and yaw axes all the way, slowly at the end;
10. Press the Master Mode ministick center button and when the LED turns red move the ministick all over;
11. Move the Gate Cont ministick all over;
12. Squeeze the hand brake lever a few times;
13. Squeeze the secondary trigger, release it, lift it in Safe Position (it should be in Armed position when you start calibrating);
14. Press the End Calibr button.