Chain tugs, tug nuts and tensioners

Using one of these MKS tugs. Still having to re-adjust my wheel for chain tension every couple of weeks. How can I be doing it wrong? Is there something I don't understand about the reverse-thread?
I got the intstructions pictured in the OP, but I don't know what's going on, especially the final three pics.
I've googled as much as I can but all I can find is discussion about which way round to put them.

Waste of time, take it off