I finally got around to changing the shift detent pins and bushes today. A bigger job than I had hoped but thanks to my mate Mario, we did it in a day. We had to remove the box and do it on the bench. It has made a big difference, however it may be a bit too late as I think the syncro on second is a bit far gone. If this job is done early enough it would have saved the syncros.
For people who dont know, the detent pins allow for smooth gear changes and can get worn and sticky. I believe this is only an issue on the 5 speeds.