Got one on a trailing shoe that's just been fitted to the tanker but I can't seem to find any grease nipples on it? I was assuming there must be some or is there not? I wasn't around when the chap came to fit it and my work mate says he didn't mention anything about maintenance. So my question is are there any grease nipples on them and where do I find them? I'm a lifelong stockman who is having to try and be a tractor driver because my boss can't get anyone so apologies for the stupid questions