I don't use any spacial tools, though I've seen plenty of recommendations/UTube videos to connect the jug to the fill port with a clear plastic tube. I simply turn the wheel hard to port, pour a little in (just covering up the gear pump, but not coming up to far in the fill hole). Slowly turn hard starboard, pour in again to cover gear pump. Repeat until the level is steady - just above the gear pump - as you turn side to side.
Changes in L'Attitudes
1999 Maxum 4100 SCA