Quoted from rwarren28806:OK I can see that. How would you hold the screw underneath? There is very little room.
Put a philips bit in a 1/4" socket to hold it beneath and you should be good to tighten the nut from the top:
Or get one of these handy Neiko 03044A Mini Ratcheting sets:
https://www.amazon.com/Neiko-03044A-Ratcheting-Screwdriver-Close-Quarters/dp/B000XYOUS6 data-aspect="571/407" data-sizes="auto" data-srcset="https://imgproxy.pinside.com/1Y7sYUpzShGqIuofbS3Xh4VaqDGX-g0Uuije3McfKKc/rs:fit:1024/q:85/fn:Pinside_forum_5202186_0/aHR0cHM6Ly9vLnBpbnNpZGUuY29tL2EvMjgvY2IvYTI4Y2JhM2Y2MmZmM2FjZmM3NDcwMzNjOGExODlkMTYzMDYxZDQ0NC5wbmc 1024w,https://imgproxy.pinside.com/HfmzOCdqjV8omk65K3YPI5Kw0rzeyVgiOESjNm1TGTQ/rs:fit:512/q:85/fn:Pinside_forum_5202186_0/aHR0cHM6Ly9vLnBpbnNpZGUuY29tL2EvMjgvY2IvYTI4Y2JhM2Y2MmZmM2FjZmM3NDcwMzNjOGExODlkMTYzMDYxZDQ0NC5wbmc 512w,https://imgproxy.pinside.com/Ee8mmQfebGQQUAN6o1VtYAGVK0IxgoKPwFsOz1tEATE/rs:fit:320/q:85/fn:Pinside_forum_5202186_0/aHR0cHM6Ly9vLnBpbnNpZGUuY29tL2EvMjgvY2IvYTI4Y2JhM2Y2MmZmM2FjZmM3NDcwMzNjOGExODlkMTYzMDYxZDQ0NC5wbmc 320w" data-src="https://imgproxy.pinside.com/nzMVAv2wDCZz47KBz7EI8dcrlM51mtZZYKLOxsWBZVk/rs:fit:800/q:85/fn:Pinside_forum_5202186_0/aHR0cHM6Ly9vLnBpbnNpZGUuY29tL2EvMjgvY2IvYTI4Y2JhM2Y2MmZmM2FjZmM3NDcwMzNjOGExODlkMTYzMDYxZDQ0NC5wbmc" />https://www.amazon.com/Neiko-03044A-Ratcheting-Screwdriver-Close-Quarters/dp/B000XYOUS6