Steering Coupler Rebuild "How To"

Hey Guys, Great info and forum...Thankyou !
I bought a 71 Demon about 1.5 years ago and not sure what is going on, but I have 2 of those steering couplers welded end2end to make up the distance needed from the end of the steering column to the manual steering box.

• Also end of steering column shaft has what looks like a 1/4" drill thru hole that seems to serve no purpose.
• Could this have been a power steering car converted to manual steering using the power steering column ?
• If so what is needed to correct this? I have about a 6" gap between end of steering shaft and spline on manual steering box.

Thanks, Mike