Jack wonder how many calls you would get wanting you to rate a pump if you gave a range. Don't think there is a easy answer.
I would rather see a scale system of how rare pump is. That would be hard I'm sure researching companies as to how many they produced etc. I know you state how few have been found on some and that really perks my interest.
As much as I would like you to do another book,at your age I wouldn't. But this may be something that gives you pleasure if so go for it. Otherwise I would buy me a new set of darts and enjoy.
