[GreenKeys] Model 15 typebar removal question

[Reggie Moody]

Hi all.Confused....the instructions to replace a typebar on the Model 15 says in order to remove the typebar guide, you must remove two screws at the bottom. I see a set of four screws. Do I remove the two screws in the middle or those on the outsides? Sorry if this sound like I'm "way out there."
Appreciate your help. 
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