Leith,
Yeah Gnipsel should be John Thornton and he is another one of the guys that has done a lot for LCNC. I have read some of his tutorials and has good information.
I will get some pics of my oiler and you can compare to see if it is the same. I have the manual for it and will find it also. The inlet should be a standard 1/4" or 3/8" pipe thread (NPT). Depending on how bad it is you may be able to simply re-chase the threads. If I remember correctly it is aluminum, so yeah if someone hit with a forklift or etc, then it could be in bad shape and need to replace.
The 3 things I would emphasize to get working before ever moving any of the 3 axis is to get the Emergency Stop wired, oiler working and your limit switches working. Hurco used a 3 wire proximity switch and if you are not familiar with them I will show you how to wire them up. They take 5V so don't send 12, 15, or 24V to them. They work extremely well and are accurate for homing also. The reason you want to get your limit switches working perfect before any movement is the fact that if you fire up the servos and they decide to take off in toward one axis you can crash the table or spindle and then you will be in a very bad expensive mess. Nothing worse than to finally get it to move and you crash the table. SO make sure you get them working fully in LCNC before ever applying power to the servo amps. They are easy to trip, you simply move a screw driver or any metal object and that will trip them. Don't get fooled by people on the web saying remove them and put regular limit switches in. Limit switches are great, but you can get chips in them and they hang up and not work. Proximity switches are magnetic and do not need a physical contact to get to work and therefore that is why most all of the major manufactures use them for the safety.
I am super glad I got them wired as there was a few times my table took off while I was tweaking the HAL code and doing rough PID tuning. I still need to fine tune my PID, but it is pretty close.
I will be back later, I have several things to get done real quick before dark, but will get you some info together.
Robert