[Fishcop]

The micro switch has a top "cover plate" you can prise open with a small flat screwdriver. Pull up the boot gently until it exposes the white switch and pop the cap. Clean the contacts with proper electrical cleaner and a fine art brush.

Also consider rebuilding the shifter including the rubber washer that is located at the base of the shift leaver. This rubber grommit disintergrates and stops the correct lever pressure being applied to the switch.

If you guys are able to select some gears and not others, then it is almost certainly electrical. To satisfy myself a few years ago, I made and re-routed a separate switch to manually throw the clutch. I taped it to my steering wheel and used a finger to activate the clutch during shifts - it worked perfectly and identified that the microshift was shagged. I bought a new switch, rebuilt the shifter and all bushes and spent hours getting it "just right". It's a pain in the arse, but eventually I had a perfect shifting sporto...