Well. I found this little pointy thing at the auto parts store and it makes it really, really, really easy to get grease in that fitting. Its an 18 gauge needle and fits right in that hole. I would recommend it over that other adapter. One thing to remember about the needle though is it does not take kindly to being bent...
Dhamblet.
I still have trouble finding the fitting and usually have to take a towel a clean up in the joint as it gets hidden by the dirt.