I saw this idea on the Wired2Fish
website. I haven't seen it mentioned here before so I thought I'd share.
The idea is to insert a rivet sleeve into the head of a Super Fluke so there is an easy way to run line through the bait. Then, you tie on an O ring and a #4 treble and snug it up against the belly. The article goes into more detail about how to do it. It loses a lot of its weedlessness when you do this so it's better for open water. I tried it with a pack of rivets with a 1/2" grip range and 5/32" diameter. It worked okay but I want to see if there are any 1/2" with a smaller diameter. It looks like Super Gluing the rivet in place is another good idea.
You could downsize the rivet for smaller flukes or use this with other similar swimbaits.