Had this "gearbox" straight shaft around for a while. Pretty rare item since this is the only one I've seen so far. I wanted to put this on one of the early engines for a display of a model L setup. Unfortunately it uses the old cork style clutch which need the taper shaft with the 2 key ways in it, and the engines I have don't have the key way slots, just tapered. Of course I completely went through the one engine first before noticing that. The engine had a completely round 1/2" shaft on it, without any flat. Don't remember ever seeing one of those before either but maybe they could be more common.
Had it apart to clean anyway so just thought some pics would be good.
Serial #0001826