I got a couple igo s2's, I don't know what the 2 stands for as they appear the same as the igo s's
The guts of these are cheap, but hey, it's a $17 super small dripper (now also a bf'r) that will screw into a Grand (haven't tried it yet on my VVW) and it's fairly easy to do with the right tools...but, and this is a big BUT...cheap guts = plated brass (I dug my cobalt bits out for nothing )...so, before anyone starts flaming "OMG! you're running juice through brass, you only have days to live"...I know...the brass thing doesn't really bother me that much, but if it's a deal breaker for you, read no further...
Having said that, here's a link to parts 1 through 4 YT vids showing you how...
Igo s2 bottom feeder part 1 - YouTube
Igo s2 bottom feeder part 2 - YouTube
Igo s2 bottom feeder part 4 - YouTube