Do what I did. Cut an old lemonade bottle bottom off, attach a tube to the neck connecting that to the oil fill hole at the bottom of the gearbox. Attach the lemonade bottle to the leg using cable ties, make sure the fill level hole at the top of the gearbox is somewhere level with bottle and just pore the oil in till it comes out the hole. Plug back in top, tube out of bottom and plug in bottom, job done and not a pump in sight!
Looks Slow but is Fast
Member of the ebay Blue RIB cover club.