hey yeah you can do it the size heilcoil u need is m5x.8 i got mine from a company called uni thread cost like £25 next day Delivery the number is 01803 559595 you get the complet kit , tap, drill bit , 10 x helicoils ,insert tools it a bargin i thought best buy i have had Hope this helped mate Tom@eastcoasttrials EDIT Only relaised tht you got 6mm threads already bes bet is to get some liquid metal and fill the holes the re-drill and tap and helicoil garrented for life