BT, just wondering what the issue is with the crankbait? Is there a specific reason why you want to weigh it down? As for clips and snaps, you can use them with crankbaits... in fact I know some guys who will purposely remove the "O-ring" and replace it with a snap so they get more action from the lure. One thing about snaps/clips is that they tend to collect weeds and slime during the retrieve. You mentioned a swivel in your post. Some clips come with a swivel attached, the problem you could experience with that it interfering with the action of the lure (too much weight at the nose).
BC
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Brendan C.