[size=18]Cannot get purchase on square nut with rad key to b

Joined
4 Jan 2005
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United Kingdom
I need to bleed one half of my rad. But the 3 different keys I have used have been unable to open or loosen the small square nut. I have tried a quick blast of WD40 to loosen it with no joy. The small square nut is so stiff the keys have ended up rounding off the edges making it more difficult to get a purchase on it. Can anyone suggest how I can overcome this problem
 
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