Elitefts.com founder Dave Tate performs one-arm lying triceps extensions (skullcrushers) using the 3" Muscle Mace attached to chains.  This variation involves the opposite arm so the extension is performed across the body.  Dave utilizes a drop set technique by lengthening the lever arm over the course of 3 sets.

 

EliteFTS 3" Muscle Mace
EliteFTS Chains