sheep rings would work as well
That takes too long, and I ain't got time to wait for nuts to shrivel up and fall off... That's why I keep several 3 blade Old-Timers around. The spey blade may come in handy at this rate, with people wanting to castrate things with a soup can lid and all.

An it's definitely no "switchblade, single hand, eyes closed" opening knife. It's a "two-hand w/steal fingers nails, tongue in the right place" opening knife.