create an axis tangent to the end of the helical curve by selecting the
curve end point and the curve as refs. Then create a plane using this
axis(through) and the right plane (normal). Then a plane normal to this and
thru the end point as a sketch reference. Then you can sketch a curve to
create the radius from the spiral to the tang(sweep it). Then extrude a
cylinder off the end of this to create the tang.
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