Side
  -----                   G grinder       c conveyor  / and = blocks
                  Gc=     L landing gear  o rotor     - block used as
    /LL            c=                                   piston guide
    ‖             Gc=
    ‖              c=         o <- powered rotor
    ‖             Gc==        ‖
    ‖               =L        ‖
    ‖            -   L        ‖
    \====================o====o <- piston assembly
                 -   -        

  Top              C <- connector
  ---              c
                  Gc
                   c     =====o
    =LL==========-Gc=====o    ‖
                   c==========o <- powered rotor
                  Gc