Further adjustment on the junction of the tip-up canopy and the forward skin. Trimming in very minor increments to avoid mistakes. Each fitting required re-alignment before the true position can be determined, eliminating interference.
Each re-alignment requires that the canopy be 'moved' to be sure the change does not modify the suspected need to trim.
Stopping short of the 'final' fit because the riveting will be delayed for hanging the engine and will be one of the last tasks before flight.