is that pump worm gear plastic and held onto the shaft with a set screw? looks very similar to the 162-266 style although the 162-266 is metal and doesn't have that groove. hard to tell size of it as well but it may be something to look into. i have a few 266 oilers but they are stashed so i won't be able to get one apart tonight for sure. somebody may have some pics on hand though.