Funny, I just did this, like maybe three weeks ago...
Leaving the tubes on the bike, held by the lower fork clamps, (since the top ones need to be loose to take off the caps,) you gotta pull off those top fork caps, since they're what holds it all together. Then pull out thr lock ring, and (as gently as possible, like a slide hammer,) tap out the seal, slide out the and drain the oil into the drain pan hopefully waiting underneath.
It's pretty easy. You should deburr all sharp edges on the holes on the sides of the tubes, and use paper (masking) tape on assembly, per the manual, when you put the seal on the tube. Pull off the tape, and slid it in just that easy; (those were the days).
Next step requires a simple tool, although with care you can drive in the seal with handmade hardwood drivers, etc. I got a lathe, so I made my seal driver from a piece of delrin (which suddenly became very expensive...) I made a groove for a hose clamp, and split it with a bandsaw. Worked perfect, you just put it together on the fork tube with a hose clamp and go around it with a wood stick and small hammer, and drive it in from both sides.
On mine, a '97 Tourer, I got a shitload of dings and pits from stones going through that 3/16" gap between the stone deflector and the fork tube Alum. casting. Probably a common scenario. I had to smooth them out with a sharpening stone, (Arkansas - whaddaya think?)
All together now, and no leaks. As long as the seal doesn't have to go over those pits too much...
