Thread the lens over the open trolley handle, fully open the trim pieces beneath the pedals, settle into place, and engage the bayonet attachment by striking the left side of the top pad using the heel of your hand.

This should not be difficult if the alignment is correct

Reinstall the small flat-head screws to retain the lens

The trolley handle should operate freely.

Repeat for second lens.

Close the trim covers beneath the pedals.