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Figure 2.8 - Permanent guide base and wellhead
                                           housing on TGB. (Courtesy Vetco)
                                   The  permanent  guide  structure,  adaptable  for  drilling  or
                            jetting, supplies the landing seat for the 30-in. wellhead housing. It
                            also  provides  final  guidance  for  drilling  tools,  BOP  stack,  and
                            completion tree if necessary. The gimballed interface between the
                            PGS  and  TGB  permits  landing  when  misaligned  up  to  10°
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