You're right, most hobbyist repair types don't have a cotter pin puller in their tool box.
Wouldn't halt a project just to go pick one up, but they work so well for removal of stubborn heater/radiator hoses, I thought it was worth mentioning - "Hey, you might want to pick one of these up next time you're at the tool store."
They are also sometimes handy for putting hoses back on in a crowded engine compartment.
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