05-07-14, 11:09 PM
Is it sheared or has the allen key twisted in the top of the bolt and rounded off the allen key edges?
If it is rounded off where the allen key fits then take a T30 or T40 size Torx and hammer it in where the allen key should fit then use and impact driver to loosen it
If it sheared punch mark the centre good and deep and use a left hand drill bit to drill into it slowly (using a variable speed drill with reverse on it and the heat will break the and and the left hand drill bit will spin it out. Start with a small bit 3.5mm and work up. there is less chance of breaking the bit if running slowly
If it is rounded off where the allen key fits then take a T30 or T40 size Torx and hammer it in where the allen key should fit then use and impact driver to loosen it
If it sheared punch mark the centre good and deep and use a left hand drill bit to drill into it slowly (using a variable speed drill with reverse on it and the heat will break the and and the left hand drill bit will spin it out. Start with a small bit 3.5mm and work up. there is less chance of breaking the bit if running slowly