Helicoil is a brand name of a type of an insert. There are many others on the market.
About every 6 months someone on the Boxster message boards reports having stripped the threads in the aluminum hub trying to remove the caliper bolts.
The question is, can you save what you have without having to drill for an insert. I do not know anyone who has used an insert. I have never asked the mechanics at the local dealer what they do, since I know the answer. Put in a new hub.
If all the threads have pulled out then you are out of luck.
If there are enough damaged threads that can be fixed to hold 63 foot pounds of torque then try that first.
On the left is a thread restorer tap and die - that fixes damaged male and female threads. On the right is a normal tap and die that cuts new threads. I have the Sears restorer set mentioned by derb, except I have the 48 piece set. It is actually made by Kastar Hand Tools in the US and sold under different names.
