10-05-17, 11:25 PM 
		
	
	
		All reassuring to hear thanks guys!
I have ordered a 3.5 cobalt drill bit so hopefully that will work, I'd imagine once I've broken through the case hardened surface then it should be much easier. (touch wood). 
 
Will keep you updated.
	
	
	
	
I have ordered a 3.5 cobalt drill bit so hopefully that will work, I'd imagine once I've broken through the case hardened surface then it should be much easier. (touch wood).
 
 Will keep you updated.

 
 

 
