Oh dear, looks like I have a duffer. First, one of the clamping screws wouldn't go far enough to clamp the wire leg. Used a spare grub screw, which was twice the length of the original and eventually got that to work (although the threading was really tight).
Got it all set up, took a vape and I had absolutely no airflow. Took it all apart this morning and noticed there should be a hole in the 510 pin about half way up to feed the air. There is a slight indent where one should be but its blocked.
Oh, the joy of clones. Will have to wait for my SXK version to arrive.
I'm not exactly gutted at a fiver LOL