How to attach something to the smooth shaft of a DC toy motor? Answered

With the right attachment for example ;)

You can get pulleys with grub screws, press on fittings, glue on fittings......
I could go on for hours but why bother if there are no details provided....

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Clean is with some alcohol, And then glue some Epoxy. That should work well.

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Zip-Ties

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Hose Clamp

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I drill or grind a tiny slot for a piano wire to help Loctite hold the shaft pulley...

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What are you attaching to the shaft.

Most pulleys and gears are press fitted.

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