The Arrow Toolkit provides the following features:
Create an arrow along any spline
Adjust the banking of the arrow
Adjust the size
Adjust the size of the arrow head separately
Change the position of the head
Editable Mesh-Subdivision
Twist Arrowhead
Adjust percentage length along spline
Using the toolkit is easy! Just create a spline, merge the c4d file to your scene, select the tab 'User Data' and drag the spline into the 'Spline-Port'. Now you can alter the parameters for the arrow in 'User Data' as desired. To make the arrow look great i recommend to use a Bezier-Spline as path, set the intermediate points to 'Natural' and alter the number of points until the arrow looks smooth.