These photos illustrate my over the top fix for a leaking tip on a new Goldenrod oil can. The new diecast tip leaked because of a casting defect. The tip was set in epoxy, so I burned it out.
I got the smallest quick connect I could find from Small Parts, threaded 10-32. Then I made a new end of 1/2" and 1/4" brass stock, with a counterbore and internal 10-32 thread on the big piece, and the
1/4" piece threaded to match. Then I attached this assembly to the flex tube with some loctite and screwed in the quick connect.Next, I just turned some tips to fit the different oil points on my lathe and turned the back end to match the male quick connect piece. Now I can change tips to suit, and if I need another, make one with an inch or so of 1/4" brass stock.