Need way to lubricate NSK LS15 linear bearings

[Mr.Chips]

I have used several NSK LS15 linear bearings in the construction on my CNC, however i cannot find a way to get grease into them, they have a fitting that is shaped the same as a standard fitting with a spring loaded ball but is much smaller in diameter than the standard fitting, can anyone help me to find out the proper way to get grease into them.
Thank you.
HH

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