My first MoI

 From:  BurrMan
1821.3 In reply to 1821.2 
I sharpened up the point with a Boolean line then I Mirrored it and Boolean Union to get a double edge.

Here are some pics of the previous post for a visual understanding.

Duplicate edge

Attach as desired

Extrude all but

Sweep this

With 2 rails

after pointing tip and mirror Boolean (See 3dm file here)

EDITED: 19 Jun 2012 by BURRMAN