ZFE Helicoil Thread Repair Kit M4 X 0.7 Drill And Tap Insertion Tool Sets Helicoil Thread Repair Kit M4 x 0.7 Drill and Tap Insertion Tool 1.Drill out damaged thread using correct size drill bit 2.Tap re-drilled hole using tap supplied. 3.Load coiled thread insert into installation tool. 4.Screw thread insert into casting. 5.Using the break pin tool and a hammer break of the installation pin.