i2c interface module w/ 16×2 lcd connected to pi zero

Lcd illuminates but no text is being displayed. On the back of the i2c interface module I turned the screw in both directions, however the contrast was not adjusted. The screw is now stripped. Would it be possible to add a potentiometer to control the brightness?

configuration:

pi@raspberrypi:~ $ uname -a
Linux raspberrypi 4.4.27+ #2 armv6l GNU/Linux

pi@raspberrypi:~ $ i2cdetect -l
i2c-1 i2c       20804000.i2c  I2C adapter

i2cdetect01.png
raspi-gpio01.png

raspi-gpio02.png

raspi-gpio03.png
pi@raspberrypi:~ $ vcgencmd version
Copyright (c) 2012 Broadcom
version faf071dd4885c5ac1a89483d35a5326e7f69495f (clean) (release)

gpio_readall.png
installed python-smbus and i2c-tools

enabled i2c in raspi-config
raspi-config.png
lsmod.png

config.txt.png

hardware setup:

lcd_backplate.JPG

lcd_closeup.JPG

lcd_bright.jpg
lcd_back.JPG

pinout
pinout.png

any suggestions on what else to troubleshoot?

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i2c interface module w/ 16×2 lcd connected to pi zero

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