Its worth doing the 3/4 syncho springs ASAP. When I got my series they must have been broken but not having driven a series any distance before I just lived with very tricky down changes. That is until I was in traffic on a very hot day in Bristol town centre going to the balloon fiesta when the car in front stopped suddenly and I changed down without thinking. Bang went the teeth off 3rd, we limped on to the camping field and came home the next day on a low loader. Had to strip the whole box as the teeth that came off kicked up into 4th gear and trashed that too. When I stripped it the remains of the springs were in the bottom. I now have a magnet in the bottom.