Made my post for a Furuno 1623 out of a 2 inch alloy pole found at a
sailing club - either a boom or spinnaker pole. I cut the platform
from 6mm marine alloy sheet together with some reinforcing corners.
Socket was made from a SS316 tube cut to make a clamp and bolted
through into superstructure. Painted with Hammerite primer and white
smooth paint Cost £very little. Seems to be prefectly rigid in use
with slight flexing in strong winds. May fit a brace to the
wheelhouse.

Can be seen he
http://www.luxe-motor-kei.co.uk/steel/page/image58.html
http://www.luxe-motor-kei.co.uk/exte...e/image40.html
http://www.luxe-motor-kei.co.uk/deli...e/image42.html