Here you can see the locking bolt used to tighten it up. Push the nylon lined liner on to the carb manifold already attached to the engine as far as it will go. A few taps with a rubber mallet on the front of the carb will ensure it is seated correctly.
Turn the nut to around 10 O'clock and tighten using a short, flat blade screwdriverjust to nip it in position. Now tighten with an 8mm spanner to finish, ensuring that the position of the carb is upright and vertical to the road.
This image shows how easy access should be to the ring collar holding the carb in place. There is no need to apply excess pressure when tightening this collar as it will get tighter during normal running conditions as the heat makes the alloy neck and manifold swell.
Correct alignment shown.