Most people don't like the numbers, but I like them personally. I wouldn't worry about resale, as long as they are light tight you're fine.
You can keep the disk and re-install it.
I never had any "instruction" manual but it's pretty obvious with older things how to disassemble them, I just unscrewed everything and then you can just place (or remove) the wheel, it's only held in by two pins, and if you don't RIP them out, and instead disassemble and remove them, they are easily re-inserted. If you grab and rip it out, then yea you can't re-insert it because you'll have broken the pins.
Good luck!
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