G'day Mark.
Crikey, you can say that again! Telepathic Porsche de-bugging?
I have the same shaft movement and you may recall in our last conversation regarding the bump steering kit I mentioned I was chasing my steering column chatter.
I ordered the bushing, installed it - and it made absolutely no difference! In fact the nylon bearing WAS intact (not disintegrated) before I installed it. In hindsight I now wish I'd left it alone, oh well. The installation of the bushing is a piece of cake - a talent rating one, but it WILL destroy what maybe a perfectly good nylon bearing as was my experience, causing an increased lateral movement between the shaft and the bushing. Interestingly it was a snug fit upon installation but after a couple of days .....I was disappointed.
I don't mind if someone here says I'm giving wrong advice - but my humble opinion is that if the shaft itself is worn - the bushing will do nothing or very little, except maybe where the OEM nylon bearing is visibly and actually knackered - it *may* reduce the lateral shaft movement but I'm now sceptical that it will actually eliminate it. I'm sure the flexibility of the upper OEM nylon bearing is designed correctly as a snug firm fit (albeit sacrificial)
I found the shaft to be slightly worn where it is contact with the upper bearing but I don't have the tools to remove it so I've booked it into Melbourne Porsche with instructions to dismantle and rebuild the complete assembly - replacing the upper OEM nylon bearing and being new it will take up the worn shaft slack) replace the shaft if necessary, the uni joints, the yoke will be investigated and the lower bearing replaced together with what ever else they diagnose.
This is all happening in 3 weeks and costing $$$ but I'm assured of near as new steering
Stay tuned if you wish.