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To put a dot on the exact tip of the spinner, we put a piece of sandpaper on
the floor, set the spinner (pointy side down) on the sandpaper and used a level
(along the rear/top) to ensure orthogonality to the floor. When we were sure
of it being level, we carefully spun the spinner. The sandpaper made a
slight mark on the exact tip.
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The spinner
is installed by repetitive trimming of the cutouts for the prop blades.
This is a slow process requiring lots of patience (best left to Ken!).
After the cutouts are made, we drew a small dot on the exact tip of the spinner
and spun the prop to ensure the dot tracked a stationary object (a nail that was
set to just touch the tip). This wasn't as bad as it sounds and soon we
were able to drill the spinner to the rear and forward mounting plates.
Our spinner
was too large (or the front plate too small) for a tight fit. We mixed up
a batch of micro balloons/epoxy and put a thick layer all around the
plate. Then we covered it with plastic wrap and carefully put the spinner
back on and cleco'd the rear edge. After curing, the spinner and plastic
wrap were removed. We cleaned the edges of the plate with sandpaper and
now have a perfectly fitting spinner/front plate.