further update for anyone with same problem. due to such little room between the broken stud and the aircon pipe and radiator ( only 5 inches clearance )tried a flex drive and tct 3mm bit. this started to work but the extreme angle the flex drive had to work at broke it before the drilling was complete. got a 90 degree right angle drive and this succeeded. cheap chinese easy outs proved useless so following advice from the proper engineers on here i used a t25 torque bit hammered into the drilled hole and this worked a treat, out came the final offending bit of broken stud. now to put it all back together.
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