Apple Macbook pro fans

I got the following enquiry from Ed deBolt:

"I want to lube my MBP fans but when I take the laptop apart and peel back the sticker on the fan then there is fixed aluminum cap which does not seem to want to come off. I haven't forced it yet so maybe it will come off but don't want to mangle it.
Do you have any knowledge of the Apple Macbook Pro Fans?"