I have an Altec LR IV. I got a service manual for it and it says to remove the cover on the upper boom side of the Knuckle and grease it. There is a Zerk on accessible on the outside that is not mentioned in the manual but when you remove the cover there is no tube connected to the thing on the inside so it's basically just globbing up the grease. I assume this is an "improvement" that's not noted in the manual. I have felt around to find where it might connect with no luck. Any ideas? Thanks