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The maximally extended Reissner--Nordstr\"om (RN) manifold with $e^2 < m^2$begs for attaching a material source to it that would preserve the infinitechain of asymptotically flat regions and evolve through the wormhole betweenthe RN singularities. So far, the attempts were discouraging. Here we try onemore possible source -- a solution found by Ruban in 1972 that is a chargedgeneralisation of an inhomogeneous Kantowski--Sachs-type dust solution. It canbe matched to the RN solution, and the matching surface must stay all the timebetween the two RN event horizons. However, shell crossings do not allow evenhalf a cycle of oscillation between the maximal and the minimal size.

The charged dust solution of Ruban -- matching to Reissner--Nordstr\"om and shell crossings