In another thread, Rob said that the inside dimensions of the brass cup for the VV Grand is 0.56 inches. If that's the case, then it'll fit. And I think (pretty sure) all the brass cups are the same as the catch wells on the metal REOS....let's hope. They seems the same to me (I measured with a crappy ruler). Anyway, the Chalice dimensions are 14mm which equals 0.55 inches, so....should fit with 1mm to spare. Fingers crossed. I absolutely KNOW it will fit on the VV Grand because that's what I tried it out on a couple of months ago.....
I heard the Reo Mini had a smaller catch cup, and I wasn't sure if the 18490 would be included in that since on the site it's called the Reo Mini 2.0 - 18490, but if they all have the same size catch cup that makes it easy...
Off Topic, what are the dimensions of the 18490? I can't seem to find them listed. In fact, there's not a lot of info about the 18490 in general.