I've had experience with two different types of reels: Stainless steel hub-loading with a film retention spring clip on the hub, and plastic rim-loading using a “walking” action to load from the rim to the hub along the guides. I've never had a reel that uses hooks to catch the sprocket holes.

Do you have any images of the reels? without those I don't think I'll be able to help you that terribly much more than with what I've already said.

Thanks!