I don't have a picture, but I can describe it:
I use a vacuum generator to fill my forks with oil. I have SS top nuts that have ports in them plugged with button head screws. I made a set of adapters to connect a vacuum generator to the top nut port, and to connect a tube to the drain plug port. I measure out the desired type and quantity of fluid, hook up the apparatus, and draw the fluid in through the drain plug port. Leaving the vacuum on, I remove the adapter/tube from the drain port and put the plug in, then shut off the vacuum.
No mess, fluid is in at the exact quantity in seconds.