Usually they can jsut be dropped straight in. Depending on the model some have two blobs of solder on them to prevent ESD which need removing but usually you can drop em straight in an expect good results. Occasionally I have had to adjust the azimuth cog/cogs but only occasionally 
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Zap Brannigan quote - "You remind me of a younger me Fry, Not much younger mind, perhaps even a little older."
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