For any new readers, there are only 3 rules.

Rule 1.

Rule 2.

Rule 3.

Once your share has earned some dividends and you re-invest those dividends back into your snowball, even if you have to sell at a loss, you will in time earn back those losses from the re-invested dividends. If you re-invest your dividends back into the share in your snowball, any loss will sit in your account forever.