Downside of Being Interrupted on Projects is Forgetting What You Have Already Made

I had already made the diagonal mirror holder some weeks ago.  When I mated it to the piece that holds it, I discovered there is not enogh clearance around the hexnut that holds the screw in place to turn the 6-32 collimation screws.  I made that .696" square a bit smaller than necessary (trig was never my friend) and too small to work.  So I am cutting a .845" square now.  That will be big enough.