Motorcycle Repair: VT700C turn signal replacement, hex head, rear fender

Question
Hello,

I have a 1984 Honda shadow 700 (VT700C).  The rear turn signal rubber mounts have dried and cracked and I cannot figure out how to remove the old mounts.  Inside of the frame through which the mount extends there is a plastic protector that partially unscrews and barely exposes a nut, which I am assuming must be turned to remove the old mount.  This plastic protector quickly runs into the rear fender.  I have removed the wiring and bulb/housing.  I have removed the remnants of the original rubber mount exterior of the frame.  An 18mm hex head is observed.  This hex head has a cutout on one side through which the wires pass.  The hex head is thin, only about 1/16 inch.  I don't think this has any significance since it was molded in the original rubber housing.  Thanks in advance.

Answer
http://houseofmotorcycles.bikebandit.com/partsbandit/oem_schematic_view~schem_de...

This link shows the components in their locations and positions.

If link is too long, just go to Bikebandit.com site and then choose OEM parts and scroll through the menu options.

Bill Silver