"Worked fine" is probably a misnomer, unless your experience differed from mine.
I found I couldn't go from reserve to main without passing off, in which case the engine would instantly cut out. First off, the modelling is incorrect - there's fuel enough between the cock and the cylinders to keep the engine running for the half-second it took to pass the off position. Secondly, you should be able to go to main from reserve without passing off at all, as this is part of the normal procedure when taking off with less than a certain level of fuel in the main tanks - half full, IIRC.
Cheers,
Fred
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