There was nothing destined for the other opening in the bridge.
I think they were designed that way so that no matter which way you turned it when spowelding it on to the base, you couldn't go wrong for correct carburator stud alignment.
Lots of summer students working at Fram in those years in peak periods.
Some were not well versed in reading the prints, as evident by the batch of adapter rings escaping with the nuts welded on the top.