Join Date: Mar 2008
Location: The 'Wack, BC, Canada
Bikes: Norco (2), Miyata, Canondale, Soma, Redline
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That's not a dust cap, it's a plastic support bushing. And what you see is what you get. It's just a little recessed. When you remove it you'll find that in section it's a "T" shape with the spline on the outside and a slight taper to support the end of the sealed cartridge on the inside.
I too suggest the CCP-22 over the one you showed which needs a socket set to use. I've used my '22 for years now and it's still running strong. I doubt that it's possible to wear it out in home use. Just keep a little thick oil or grease on the threads so they don't wear from dry friction over the years. And with the right bit in the end they work with ISIS or Octalink as well.
And yes these two tools are all you need. Once you have the BB cartridge out you'll see that it has a label on it that says what the spindle length is so then you can go shopping for the new one. I suggest the UN-72 as a nice upgrade that is still not expensive. The last one I bought about 6 years back was only $26. Down south of the 49th I suspect that even with todays prices it will still be about the same. Or even cheaper online. The '72's break in after a few miles to where they are so free rolling that you'd swear that they are worn out and all the grease went away. But they go on for many years like that and just keep on ticking.
I wish I'd kept my mid 90's Hardrock. A superb "best bang for the buck" bike if I ever saw one. I had the metallic red version which was one of the last years of the CrMo frames. Looked sweet and rode even sweeter than it looked. Take good care of yours and ride the tires of it, replace and repeat for years to come.