[TowerTalk] thrust bearing lubrication

[Kathy Bookmiller]

Hi TTers,
I got that Rohn 45 tilt-over down and home last week. In remarkably good condition. Only thing I wondering about is the TB3 thrust bearing and how to lubricate it. It turns freely but has a notable rumbling sound and feel to it. I notice at the bottom of the inside shaft area where to mast passes through, is a recessed Allan head fitting/plug. Would this be the place to remove and squirt in some white grease? And then replace the plug? 
Thanks for your guidance,
Kathy