What are the materials i will nedd to mag my 4/0w? I already have an aluminum spool
It depends on how elaborate you want it to be. But the best/easiest one I saw here somewhere is glued steel washers and magnets. They could remove the magnets or add as they needed.
Thats what i was gonna do, im gonna google it and try and find an in depth tutorial
Check this post for some idea as to what is involved in magging a Penn 4/0.
http://alantani.com/index.php?topic=5585.0