Robert Morse
Sponsor
What you are referring to was traders and customers resetting the 14 day REG-SHO requirement by doing a DITM Buy-Write where the other side would exercise the calls that day and go out flat. The call seller would get short again the next day, but the 14 days reset. Later, a few years later, there were very large fines.
I thought that it was illegal for anyone to short via conversion at that time. If I recall they had killed all the loopholes (except the market making one).

