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I decided that i was going to install Whelen A600-PG-PR
combined nav / position strobes as seen in the following images.
I first made a plywood template identical to the base of
the strobe head. This was then used to draw around on the centre line of
the wing tip. This area of the wing tip was then removed and the plywood
template was wrapped in Clingfilm and placed back in to the opening and
taped in to position
 
Working from the inside of the wing tip the plywood insert was floxed
around to make a smooth edge and then 4 layers of ply was glassed over
the whole area.

After curing the plywood template was removed to leave a mounting rebate
to locate the strobe head. The rebate was then modified to take the
strobe head, and corner anchor nuts were used to mount the strobe head
to the wing tip.
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