Seen/used these carb nips for cable end?

#1
Yeah I know, odd subject, but thats what they're called.

I got these specifically for the application they are intended, but the shop I bought from had no idea how to attach them to the cable end. I'm assuming they would need to be crimped, but with what kind of tool? Regular wire crimpers? There's not much length to play with on the nips.
Anyone use them before? Think they can be soldered to the cable? They look brass to me. They are going in a round slide.

 
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