801 atty hasn't yet leaked on me.
That's not to say it isn't possible....
Goosenecks are nice for sure, but not a 'must have' for the Darwin. The swing arm itself kind of acts like a gooseneck. If you've got the money, grab one
It is sealed up pretty good. The
thread and air intake is quite different on these.
I have an
Empire Mods drip shield that I use with 901 and 510 stuff.
You can also use rubber gaskets and a 510:510 extension or adapter to make a simple drip well.