Rob suggestion is how 95% of guys that use that bait. I saw Greg G's rig that he was using at clear lake that was actually a decent rigging in my opinion.

He ran his line through a "pro-rigged" Osprey and tied it to a 3-way swivel. He then used either wire or just split rings to attach two trebles and impaled them in each side of the bait. To me... it was too much hardward but the concept was good in my opinion. I have other baits that I use a similar rigging with and the fish typically get stuck pretty good.

If I was to rig an Osprey like that... I would run my line through the bait and tie on a split ring (or solid ring would be better). I would then crimp 2 pieces of wire to the ring and impale them in the sides of the bait.

Either way... maybe I need to wrestle the Ospreys out of my cats play area to try different riggings for you.