How do I attach a sprite to a model? (not a particle)

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Basically, I need to create a custom model with a sprite attached to it. I know how to create attachment on models and how to attach particles to those, but I am not allowed to use custom particles.

The [url=https://developer.valvesoftware.com/wiki/Attachments]Attachments[/url] page of the wiki says that you can use them to attach simple sprites, and the [url=https://developer.valvesoftware.com/wiki/Sprite]Sprite[/url] page shows a picture of the HL2 combine turrets that use sprites for their flashlight (not their muzzleflash).

So, is there a way?

[Deunan]

Try the same method as attaching particle just use a sprite instead?

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[QUOTE=wraithcat;40916938]Try the same method as attaching particle just use a sprite instead?[/QUOTE]

and what would be the syntax?