Rear Wheel Bearing.

[RocketSteve]

I feel you're spot on with your description 1675, the only experience I have with splines on a drive shaft were back in the day with a Lambretta, that was a tapered spline but I don't fancy the idea of breaking this drive spline then finding I can't get it back together.

Will give it some miles and keep a close eye on the play.

Over complicated for sure, a conventional car drive wheel set-up is basically what we have here. 

[1675]

I have a workshop at home with a lathe, vertical miller, surface and cylindrical grinders and a jig borer. I 3was a tool maker for a company involved in the manufacture of driving axles for goods vehicles and buses before a forced career change. I also have access to a tame cnc machine shop and although this is indeed a very tempting offer which I feel is within my skill set I am going to decline it, but but still reckon this is beyond the realms of a home tinkerer! Factor in that if I was to attempt any repair which failed and my house would be taken from me by lawyers, I would be reluctant to offer such repairs. The sad state of modern manufacturing that it is recommended you just fit a new unit from the manufacturer. Just off to grind some gearbox parts I have made for a vintage bike whilst sucking air through my teeth at the comfy shoe wearers who are lying down on roads in front of decent folk who just wish to get to and from work. Where did I park my steam roller?

[earthman]

I totally understand, I'd still like to see a dead one stripped just to see how Triumph had designed it.

[RocketSteve]

I'm quietly reassured by fellow members that have similar play and will keep my MoT guy up-to-date with the DTI 0.2 mm measurement etc.

It makes sense that we have a little movement here or there might be seizure problems when the back end heats up, I notice the slight play is also there when stone cold.

Who knows Steve, a cheap Exploder shaft unit might become available that we can play with in the distant future...