Yep, get that third screw in. I replaced some general cams last friday night on a customers bow at the shop because of this issue (cam cracked/broke-just about ripped the module in two)
And yes it was a pain in the ass because you had to keep putting the bow in the press to get that middle mod screw in or out. Modular bows that need to be put in the press are a pet peeve of mine.
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Shoot what you like and have confidence in - don't get wrapped up in popularity contests
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