The first screwdriver can now be used to raise the two short connecting rods and the main conrod. This leaves everything in roughly the right position, but leaves a gap so that you can see the hole in the wheel. Go back to the previos photo The arm of the eccentric crank needs to point towards the balance weight) the blanked off part of the wheel where there are no spokes. The rivet st the end of the platic crank needs to be almost over the centre of the wheel. Manoevre the plastic crank with your fingers. You will be able to feel when it is resting on the sqaure hole.