  The fiducial argument of Fisher (1973) has been described as his biggest
blunder, but the recent review of Hannig et al. (2016) demonstrates the current
and increasing interest in this brilliant idea. This short note analyses an
example introduced by Seidenfeld (1992) where the fiducial distribution is
restricted to a string.
  Keywords and phrases: Bayesian and fiducial inference, Restrictions on
parameters, Uncertainty quantification, Epistemic probability, Statistics on a
manifold.
