Now don't laugh

, try this first and then if you want to laugh go ahead. Rig the smelt with the half hiches then lay it on the floor of the boat or other flat place, now step on it so it is smashed good. Throw it in and see what happens.
I have done this after hearing about it and it worked well, you don't want to smash it to the point that the bait is falling apart. The males work better for this.
Fishalot