I was using a 901 in the UFS with an adapter stealth 510/901. With the 901 close fully the liquid control and uses only the air control.
Has some problems of flooding, especially when charging, but then settles down well. The 901 is a great atty
But the best thing is to close the hole of the 901. I used a rubber strap made from a rubber tip of the mini 801. This way you can use the adjustment of the liquid and air as in a 510 and the atty not flooded.
