I noticed the dreaded vibes becoming evident the last few months, so on checking I found play in the tailshaft bush behind the rubber damper.
I knew the universal next to it was wearing out, as it had been stiff when I had the tailshaft out before, and was resigned to replacing it with the agricultural universal, as I believed the original was NLA.
I got a couple of Poly bushes from Syncro Hospital and took it to Adelaide Tailshaft Services to have them repair it. I had a call from them to tell me the genuine universal was now available for $120, as opposed to the other for about $25.
Bearing in mind Phil's advice to use OEM, I went for the genuine, and the mechanic was happier with the quality too.
All together now and all the vibes gone!
The genuine universal is available from Hardy Spicer Part No KS-A767 and I have a spare poly bush if anyone needs to go down the same path.