It is easier to install the speed selector with the shutter cocked and the selector set to 'B'.

Check that the pallet and delay rods are properly coupled with the slow speed governor (if installed) and seated in their pivot holes.

Check that the upper levers of the rods are in the correct positions around the wind gears.

Place the high speed cam on top of the wind gear. Make sure the driving peg rides in the slot of the cam.

Lot's of different pieces have to be aligned all at once when the speed selector is installed. Do not tighten down the mounting screws until everything is in place. Work patiently and carefully.