Welcome to the group Lostuzer,
What sort of pool are you talking about ? I'll take a stab at some of your questions.
You can clean the front of the objective just as you did the eyepiece, using your Q-tip and lens cleaner, just be sure to use very little lens cleaner. I think the objectives are interchangeable between microscopes although I'm not sure why you would seeing that they are basically the same. The easiest way to see how they work when moved from frame to frame is to do it and record what happens. I would definitely be in favor of a 10XWF eyepiece. It will make viewing much more comfortable. The AO is a 1947 model and the B&L is a 1951. Both of these scopes would have been found in university settings as well as medical practices. I know a doctor who is still using one just like the AO. The B&L scope originally had a sub-stage illuminator, a small box with a light bulb in it. I wouldn't worry about the apochromat at this point. You've pretty well emptied my brain... Keep us posted as you make progress. g2b2

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A pixel is worth a thousand words but it takes a thousand words to explain a pixel. g2b2