  We derived the properties of V605 Aql before the final helium flash pulse by
studying its surrounding PN A58. Photoionizing models of our spectral data
together with a new distance estimate and a closer look at the recombination
timescales lead to a consistent model. Comparing our findings with the only
hydrogen-poor twin, namely Sakurai's Object, we conclude that these born-again
objects have normal PNe core masses. We are able to prove V605 Aql indeed to
be, similar to V4332 Sgr, a very late thermal pulse object and to put
constraints for the evolutionary time scales for the transition back to the
AGB.
