Axle hole primitive on a Bar connection.

[Philippe Hurbain]

But if we only look at the regular axlehole.dat, my opinion is that it is doable.

Possibly yes, but what kind change would you make? Blunt the sharp angle?

But would this change, to some primitives, force all affected parts/files through the PT ?

No technical need, but ideally all affected parts should be inspected for unwanted side effects...