I just did a write-up on how I rebuilt a set of 911 rear "M" calipers on my web site.
Here is a link;
My Webpage -- how to rebuild rear "M" calipers
One of the issues covered in the write-up deals with the ARP bolts used. This was discussed in a string elsewhere here in 914world and I'd like to avoid it becoming another heated issue. I included in the write-up a disclaimer.
Let me know what you all think.
Wes Vann