>>Go to Hinterberg.com. They've got instruction sheets for everything there, ....
Actually I did. I even looked through their forums. And of course read my manual and looked at scads of YouTube video's for this and similar frames. None of them said anything about "where" to put the machine on the carriage ... just "place the machine on the carriage". Can't believe that not one of them even said to center it. I knew that much ... but didn't know if there was anything else missing.