With the B70, the center hole is probably not going to line up with the end pin so you are going to have to adjust for that as well and drill the center hole before anything is lined up. What I liked about it was that the center was open so that I could hold it in place by the centered end pin before any holes were drilled.
Jay' date=' I am not sure that I agree with this statement, but I have only installed the B7.
