drop arm seal replacement

hi all hope you can help, i have read how to get the bottom steering box seal out by turning the steering wheel while engine running. but how is this done when the box is off i managed to get the drop arm off and the cir clip out now stuck on how to get the washer and seal out. help please.

i thought i would let you all know how it came out, i drilled a small hole into the metal washer got a self tapping screw into it, pliers did the rest now ready for new seals and washers to go in, if you hear any swearing next week then you will know that it still leaks