My gearbox is causing me some grief.I have finished bolting the cases back together after replacing bearings, a new 2nd gear synchro and steel fhift forks. All was going swimmingly until I tried selecting the Gears. I have and can select 1,2,3,4,5. NO BLOODY REVERSE. slider will not go past the neutral position. I have tried it with the reverse switch and the reverse gear lockout plug screwed in, still nothing. Going up to the shed to start dismantling it again to find the problem.