[alanwoodieman]

the blockers hold the syncro rings for both second and high, springs and balls present a type of lock to hold the blockers and to provide a grip on the shift coller. The blockers hold the syncro rings to bring the gears into sort of a speed alignment as you operate the shifter- the rings on the syncro's ( on inside) trap doping and this doping acts as a liquid clutch to allow the shift coller to come to speed with the gear being engaged-hope this is not too confusing and I am sure someone will provide further information