Just bear in mind that if we consider an acceptable deviation to be 1 "tick" off 12 or 3pm then the chances are 6 in 60 to get an acceptable crown position.
Therefore your potential market is 1 out of every 10 Seadwellers available (or 1 in 30 if you need it dead on), on already a fairly rare beast since its cessation.
Good luck anyway.
