IMO unless you have a tool like Danny showed this isn't possible with a 3/8 ratchet or small extension! The spring is just too close to the insert. Oh and its very weak and the spring is stupidly heavy!
Air con delete ftw![]()
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You push it backwards, so it lifts the tensioner upwards.
Its only cast ally, quite easy to break, if you do break it then its back to the jubilee method.