"Bob Engelhardt" wrote: (clip)something that does for bolts what plumbing
adapters do for pipes. One size, male or female, in and another size out.
(clip)
^^^^^^^^^^^^^^
Bob, that is perceptive of you. If that is what he is after, I suggest
welding or brazing the appropriate nuts and bolts together.

I hate to be cynical or suspicious, but there may be a clue in the fact that
he has not responded to any of the posts responding in bewilderment to him.
Normally, a person who posts a real question will follow the responses
closely and interact with the respondents.