Booth was the only well-known member of the conspiracy. Access to the theater's upper floor containing the Presidential Box was restricted, and Booth was the only plotter who could have realistically expected to be admitted there without difficulty. Furthermore, it would have been reasonable (but ultimately incorrect) for the plotters to have assumed that the entrance of the box would be guarded. Had it been, Booth would have been the only plotter with a plausible chance of gaining access to Lincoln, or at least to gain entry to the box without being searched for weapons first. Booth planned to shoot Lincoln at point-blank range with his single-shot Philadelphia Deringer pistol and then stab Grant at the theater. They were all to strike simultaneously shortly after ten o'clock. Atzerodt tried to withdraw from the plot, which to this point had involved only kidnapping, not murder, but Booth pressured him to continue.