Thanks again for all the great responses.
the round hole I am referring to is in the first ( top ) picture.
I do like the idea of self extracting screws, but I bought a few Campy cranks that are square holes( the usual ones) , so I do not think the self extracting screws will work on that.
That's ok. I just wanted to know if I could use EITHER crank with appropriate screws/ bolts
I ALSO have another thread about how and where to apply grease to the rear hub that the cassette goes on. It has a small hole for the bearings.
If someone could check my other thread and knows that would again....be GREATLY APPRECIATED !!
Thank you all !!!
Very much appreciated