Heinz, I am pleased that you found the cause creating the change in feel as you rotated the steering wheel, and seemingly identified it as the result of a universal joint that for some reason is out of alignment, and which you can hopefully rectify. I would be far less than happy with any universal joint adding anything to the feel of the steering, be that by adding play when worn, or resistance to turning either due to internal corrosion, misalignment, or being used outside it`s design parameters..
As you have determined there is now no play in the steering, I am unsure if that may be ideal in a road car, where the slightest driver input to the steering wheel could create an alteration in direction, thinking perhaps s a sneeze or body movement caused by hitting a pot hole etc...?
As I understood Lorne, this kind of steering is not supposed to have play in the design, Luddite. Something very different are recirculating ball steering systems like in an old Mercedes. They always have some play in the center.
With no play whatsoever in the steering I suspect it may require constant correction..? If you consider a similar input to the system can also come from from the road surface given the many influences found on it...camber changes, repairs, puddles, etc. A small measure of play felt at the steering wheel may enhance the feel of the steering, and perhaps require slightly less corrective input...?
If the toe-in is correct, the car should pull itself straight ahead. And this is also the case with my car. But so that the steering is not too nervous and does not follow all the influences of the road, I would like to increase the pressure between pinion and rack very slightly. Then the steering becomes calmer and is still light enough, especially to move back on its own. The play I mentioned can relate directly to the feel of the steering system, and the only play likely to be found should be at the interface of the rack to pinion gear teeth, If your pinion to rack adjustment has too much pressure in it caused by over adjustment, the steering will feel tight and require constant correction while driving and rob the driver of the ability of the steering system to self centre / return to straight ahead after turning a corner...
This was exactly the case before I started the whole investigation and the car had not passed any MOT at first. Only I had gotten too used to the too stiff steering during the whole time. Self centering was working but all was too stiff. And only because of this circumstances the MOT inspector noticed too much forces needed because the U joint issue came on top and added the peak points resistance.I can well understand that on a race car that zero play maximises the very direct feel in the steering system which may be an ideal , perhaps less so on the road, and in a car with vintage suspension design...?
Increasing play in steering (under adjustment) can also equate to wear found in other components within the system which generally can be detected by the driver at the steering wheel. In the case of my Morgan more than the 7mm or so measured at the outside of the rim of the steering wheel would alter the feel, the more that play increases the more urgent it is to look for the problem causing the increasing play, which similar to an overly stiff steering will require more driver input to keep on course...?
IcePac`s suggestion on the loose feel that may be experienced at the steering wheel if even slight toe out is found in the alignment, is something I have experienced on vehicles..
Thanks for posting the GoMoG link Heinz, I am a long time BIG fan of GoMoG and the huge amount of effort that Lorne the web master there has over many many years put into providing totally FREE access to a huge wealth of Morgan related data to help Morganeers maintain and repair their cars, and all devoid of advertising.. I suspect there is many a Morganeer who would perhaps grudgingly be forced to admit the answer to resolving their issues was found on GoMoG...?
I think Gomog is a very helpful site! Unfortunately, it is a pity that the relationship to TM is obviously not very close, for reasons that do not have to interest me.I do hope your steering FEEL can be adjusted to match your requirements of it.
I am on a good path and I am very confident. Maybe I have to find a source where I can buy such a cardan shaft with the right dimensions of everything[/color]
Good luck Heinz
Thank you very much for your kind and eloquent input, Luddite 
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