Personally, I have done all of my FD stuff at
http://www.mazsport.net/
(ask for Scott)
If you are considering any rx7 (ive noted you are looking at fc's from the drift forum), get the owner of the fc, the fc you are considering, and goto mazsport and get it tested. Last time I had a thorough inspection (~3yrs ago) it was $75, but worth every dollar. I could never give enough praise for the great work all the guys there do, true professionals.