Laminated lead keel bulb

Hi guys, I have seen somewhere on this forum a method of laminating sheet lead into a bulb using a bulb calculator, looks very easy. Any ideas where I might find the bulb calculator on the web.

Look toward the bottom of this page. Simlar threads.
easy way to create a lead bulb


what size are you trying to make?

You may read here :
and here for one method of construction :


Thanks Claudio, exactly what I was looking for;)