Anyone know how to turn a .gif into a TF2 spray?

Daedalus

Veteran XV
Or a CS:S spray (I assume it's the same process). I want to use Lemonhead in the game. I had it working like, years and years ago when HL2 first came out, but I have no idea how I did it and I can't find any decent tutorial on how to do it.
 
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