11/03/2013 1:25pm, #11
11/03/2013 5:09pm, #12
11/03/2013 5:34pm, #13
You can easily and cheaply make a facsimile two-handed flail good enough for training or sparring as shown in the videos I linked to earlier, just by securely attaching a padded "club" to a strong staff. A short Nerf baseball bat would be fine as long as the attachment was strong enough and you had some protective equipment (fencing mask and padded gloves at minimum).
The slang phrase "morning star" (in various languages) was used to refer to any weapon whose business end was a spiked ball. Note that the more standard "morning star" was a spiked ball on the end of a club; the closest I can come up with for the type of flexible weapon you're describing was called a kettenmorgenstern (chain-morning-star) in German.