Joined: Jun 2013
Posts: 4,094
Likes: 1
From: Bozeman
Bikes: 199? Landshark Roadshark, 198? Mondonico Diamond, 1987 Panasonic DX-5000, 1987 Bianchi Limited, Univega... Chrome..., 1989 Schwinn Woodlands, Motobecane USA Record, Raleigh Tokul 2
While I've never dealt with those cranks specifically, I'd remove the inner allen (8mm.) If the "cover" doesn't come with the allen, I'd remove that as well with the special hex you bought. Then use a normal (octalink) crank remover.
That's my best guess.