Interesting post Jon π.
You mention smashing up old frames, and I've done the same here in the UK, but I'm wondering why no-one purees the frames/bait fish in a blender. Not only is smashing bait up hard work but it takes an age to do properly. If the aim is to release all the oils and fine particles into a scent trail then I'm thinking of investing in a cheap food processor/blender and blitzing my bait fish then freezing them into blocks with bran.
Can anyone tell me why this wouldn't work?