Unfortunately, the He valve on the new 42mm is too big and has the wrong shape.
Why they are not able to match the size of the original, on something as simple as a little steel pebble, is one of these mysteries of life. We will never know...
By the way the new double AR coating looks terrific (on the gen) just try it on and you'll see !
This double AR thing (and the rest of the mods) is going to be a logistical nightmare. I am in the UK, the watch is in China and this "2Geek" character is somewhere in Singapore (is this a self-inflected nickname?). So I will probably need to get a new crystal from the dealers and send it to 2Geek for double AR, purchase the gen parts and have them plated (I am going for the RG version), then send the watch, new AR coated crystal and gen bits and bobs to some moder somewhere to put it all together if it fits(not sure who yet).
It might actually be easier to save £ 19,000 and just buy the gen...