You will require a Junior Hacksaw and a crimping tool suitable for RG59 coax and a 5.5mm drill.
Take a standard PL259 reducer suitable for RG58 50 ohm coax and drill out the center with the 5.5 mm drill. Now slice the reducer with the Junior hacksaw up to the threaded section, this makes the crimping easier.Remove about 50mm of the outer jacket from the RG6 cable, trim off the braid and slide the foil covered inner through the reducer. Remove the inner insulation from the protruding coax and Crimp using the RG59 crimping tool.
Screw the reducer into the PL259 connector and solder the inner wire.