not sure about GT terminals but should just be a nut and bolt to tighten clamp so just replace nut and bolt if there not tightening its most likely threaded the bolt or just buy a new one from ebay there peanuts http://www.ebay.co.uk/itm/12V-SMALL-NEGATIVE-JAPANESE-BATTERY-TERMINAL-CLAMP-NISSAN-HONDA-MAZDA-TOYOTA-/321121837532?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item4ac45a61dc