I would use Rivnutts. If the holes are big enough they will pop straight in, if not you can always drill them out to accept an M4 Rivnutt. If you want to see what they are like, and try some, pop over to my place as I have Rivnutts and the tool for inerting them.
Sorry missed your line about Nutserts (I assume that's what they are called over here).
HTH
Ivan


 
						
					 
					
					 
				
				
				
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