OK, it's "x2 - (Hub that some people use for steam engine wheels)" that I am wondering about. Would that be: part 4266, which is the smaller "sponge wheel" hub (URL) so, I don't know if that's good or bad, as I'm going to want at least 18 of them (...) (22 years ago, 20-Jun-02, to lugnet.lego.direct)