In the process of replacing my rear brakes (I finally made some time to work on it today, yeaaa!) I noticed that the bolt holes in the rear hub carrier that hold the brake calipers on had heli-coil inserts in them. My immediate thought was that some previous mechanic stripped the threads and did a marginal repair to a critical part. Well, I compared to another DeLorean and looked in the parts manual, and evidently this is the way they are supposed to be. But to me it makes no sense why they used a heli-coil when a regular thread might do better. Can anyone say if all the hub carriers were originally tapped with the wrong size and had to be fixed with a helicoil? Or did they use the helicoil to make the aluminum threads stronger? It seems this would make it weaker, but I'm not a metallurgist. It also seems strange that they would use a 7/16" x 20tpi bolt with a 5/8" head when they could have used something in metric. After all, the front calipers are held on with metric bolts, so why were the rears done in odd-ball inch stuff? Walt Tampa, FL