Subject: Re: Broken Grease Nipple Conundrum - Advice Please?
Hi Richard
Yep looks like the spring... pull that out. Then I would try an "easy out" these are similar to a thread tap but tapered and left hand thread and will bite into the hole and should allow removal of the broken off threaded part (I don't suppose it is that tight) but be gentle and avoid breaking off the "easy out" as they are brittle and will snap off if turned too hard leaving you in a worse mess.
Alternative is take out the shackle pin, drill to just below the tapping drill size for the thread and then hook the remains out and finally run a tap through again to clean up the thread.
BR
Bill
PS: Tried to attach a picture of any easy out so you know what to look for, plenty available on ebay but buy a good quality set as cheapies are more likely to break and that will make you unhappy!
NB: The one in the picture looks and was too cheap but shows the idea