I know how I would get those cut up into smaller pieces. I would use my cutting torch. If you do this, be EXTREMELY, EXTREMELY careful NOT to breath fumes and of course wear protective gear from head to toe. It would cut so fast you could probably hold your breath. I would definately have a strong fan pushing the fumes away. BUT, I have never done it before so I am not commenting from experience. I'm sure someone will come along who has tried it and may be able to comment from experience. And yes, a cutting torch will get lead hot enough to make fumes.....