I have checked my options (Heli-Coil, Perma-Coil,???) and the Heli-Coil seems the cheapest $$$$. The Heli-Coil kit is ~$30.00. One other I checked was ~$70.00!! Any good advice on this? As an FYI, I installed an aftermarket (MSR??) magnetic drain plug back in '99. Comparing the OEM and aftermarket plug, the OEM was 30% LONGER!!