Connecting a C-Tek charger

[kcsun]

My new C-Tek has arrived for the car and as well as the crocodile clips there are a pair of eyelet connectors. The earth eyelet is easy to connect to the earth post but I cannot undo the screw on red terminal, it just keeps turning???
Any ideas?
Have attached photos

kc

 

[ToeKnee]

I connected mine direct to battery in the boot.