I noticed on one of the other threads that Ivar put 60# of lead weight in the forepeak. Has anyone else mounted weights up forward to better balance the boat fore and aft?

In Ivar's case he put 60# of lead, unattached. Is there any reason why a loose weight is not OK. Can the smaller lead weight (80#) be put up forward? Where do you get 60# of lead? Is there a substance for that purpose that is more readily available (Tube sand perhaps)?