eaton HO52 brakes

[wtb853]

I am finishing up a brake job on my Eaton rear axle and have a couple of questions.

First, what is the purpose of the "collar" that fits inside the drum and is held in place by the lug studs? I moved them over to the new drums, but can't figure out exactly what their purpose is.

Second, should anything (gear oil, grease, etc) be applied to the lip of the inner hub seals to prevent premature wear? Should that seal be installed dry on the machined portion of the axle tube?

Finally, the new drums did not come with a star adjuster hole like the old ones had. If memory serves correct, the couple drum brake jobs I've done in the past all had that access hole to dial in the shoes after the new drum was installed. I really don't want to wrestle that hub/drum combo on and off while fiddling with the star adjuster chasing a tight fit. Also, leaky inner hub seals caused this brake job so I can't see how taking the hub on and off will benefit those seals. What is the practical way to put those hub/drums on ONCE and ensure a good fit (shoe to drum).

Thanks in advance for any answers or ideas.