Commercial screw eyes are vulnerable if you put them in balsa baits without also epoxying the hole they’re in. A hard knock can loosen the eye and cause it to rip out. If it loosens but doesn’t rip out, water will infiltrate and ruin the bait anyway. I prefer hand twisted screw eyes epoxied into pre-drilled holes. I’ve never had a failure with them. Making a durable balsa bait, or any wood bait for that matter, is mostly about stopping water infiltration.