i was an auto tech for 25 years. over the years i had to try and start many nuts and bolts in areas that were very hard to reach,and one could really only get the nut/bolt in the area with the aid of a socket and or an extension.
what i learned to do to keep the nut/bolt from falling off of the socket while trying to line it up properly was to take a piece of elec tape(sticky side to the socket) over the socket and then place the nut/bolt in the socket.
this would hold it secure enough that it wouldnt fall out while trying to line it up with where it needed to be.
with the sticky side of the tape in the socket,prevented the tape from staying on the nut/bolt.
other techs would fill the socket full of wheel bearing grease,but i found that to be to messy and i hate slippery dirty tools.
just a thought,it may work for this application also.