Hmmm---ok---so far so good.    But now how will Grubby hold the nut to the conduit and keep the nut from turning while he screws in the tie-down bolt? He was going to weld it but realizes that once the nut is welded to the conduit it will no longer pass through the round hole.    He could put the conduit through the round hole and then weld the nut to it.    But what if some day he wants to take it apart.    He'll have to think of something else.