Flail as a Weapon

[typhoon_driver]

I'd look at using a solid lump of metal. Now this being for a beetleweight, something like the head of this hammer might be a suitable candidate with the hickory handle removed and a chain attached through the hole.

http://www.ebay.co.uk/itm/Geological...item2a4cbacf99

I suspect you could find something similar for cheaper. But a big lump of steel or similar is likely to be your best option for a flail head.

edit - I'm not sure what access to workshop equipment you have?