I have bases from two different vendors. One of them doesn't screw all the way down on my Kgo VV, but does screw 3/4 on the Twist. On the Kgo fires but it's weak, while it works full steam on the Spinner and the Twist. I like the lighter draw, I think they're three hole heads, but all the difference I see in performance is just that. Wiggling the post is out of the question, broke 5 bases thanks to that.