I am dealing with antiparallel alpha helices in helix bundles. It would be very useful to be able to show the polarity of each helix in ribbon display by adding an arrowhead to the C-terminal end. This is the default for beta strands. Is it possible to add such an arrowhead in Chimera?

A clunky workaround that occurs to me is to designate the last residue of each helix as beta structure. Has anyone tried this: does it work?