Purchased the propshaft I previously mentioned as set about replacing the old one last weekend. Got the original shaft out, some pics including the new one to go in:
Cleaned all the bolts by wire brushing then degreased in acetone. Started to fit the new shaft and began to suspect that it may not be of the best quality. The CV joints were extremely stiff, could barely move them. It had quite a few balance weights on it and when we offered it up it was a tight fit and the centre bearing bracket holes didn't quite line up, had to force the bolts in.
All finished, took it out for a test drive and was not happy. The shaft was noticably sapping power (presumably the CV joints) and began to vibrate at 45mph right through to 60mph. It produced a thrumming throughout the whole cabin. I had a word with another member who had a similar problem with a shaft from this source but his vibration wasn't as bad and disappeared afte a short while. I thought I would give mine a few days but there was no improvement. So, yesterday I ordered a new one from Des Shelly Shafts in Wolverhampton.
It arrived today and I set about doing my second propshaft change in a week. I forgot to take some pics, doh! The new shaft is of a much higher quality - better welding, the CV joints move easily and smoothly, only two small weights for balancing. It fitted perfectly, went on a treat. The test drive was a joy, all the power was back and not a trace of vibration anywhere. Job done.
The other shaft is going back Monday.