What is the opinion of Reddit about the
Metal Adjustable Arm Clamp – Black?

If you mean drilling a hole to insert the end of the lamp, it would be tremendously unsteady. This would work far better: https://www.amazon.com/dp/B007AQXSFQ/ref=cm_sw_r_other_apa_i_1q0TFbX778GGA?_encoding=UTF8&psc=1

https://www.amazon.com/dp/B007AQXSFQ/ref=cm_sw_r_other_apa_i_1q0TFbX778GGA?_encoding=UTF8&psc=1

Did a quick amazon search Metal Adjustable Arm Clamp – Black https://www.amazon.com/dp/B007AQXSFQ/ref=cm_sw_r_cp_api_rcfYAbQAGCAV5. Would something like this work