Phil. Good to see the engine rebuild is giving the results. With regards the block on shift, this does not seem to work as the complete end is rubber mounted to move with engine. Ian who hill climbs with me tried this but it some times stop him getting third gear depending on left or right G forces. Better to do like I did. Ditch engine mounts and fit solid nylon ones. This stops engine rocking when lifting off to change gear. I was always getting your problem, but not touched fith once this year. Avon slicks you will like, but you will not like the price and the speed they wear out. cheers den.