Thanks Tommy.
Pat- I have back stitched them like you said many times and never had a complaint about the stitching coming out. But, when I am using alot of rivets, I like to tie it off under one of the rivets. I have also started the stitching by pushing the needle and thread in between the outer layer and the welt, having the needle come out in the first hole, and end it the same way. When I am done, I use a razor blade to trim the thread flush witht the leather.