I don't know a general solution to the problem, but a little playing around with the 'goofy arrowhead' approach produces a version that, for me, is more reasonable and might become quite handsome with a bit more futzing around: 
    -arrowshape => [2, 5, 4],  # less goofy

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In reply to Re: Tk:Canvas - Arc with an arrow? by AnomalousMonk
in thread Tk:Canvas - Arc with an arrow? by cmv

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