Here you can see the top of the fork leg. At the top, there's a thin groove where a spring-clip lives, stopping the fork seal from escaping. Immediately below the groove is where the fork seal lives, sitting on a big wide washer that rests on first step. Below that, there is a narrower recess where the fork leg bush sits.
The main difficulty during this job is getting the bush and the fork seal out from the dead-end which they live in.