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With the conduit in place Grubby can screw in the tie-downs and feel secure that they will hold strongly to anything tied to them.    Grubby would have found a better way to do this---if he had realized how involved it was going to end up being.    But it's done for now---and will work fine.    Grubby only had 4 tie-downs from the Ford---but they should work for most all that he needs.    He can add 2 new ones to the back later---if he thinks he will need more.