I admire your tenacity.
I generally consider the warning "No user servicable parts inside" to be a dare that simply must be tested.

But, I would not attempt this one...

For one thing, Dremel makes sparks, which could be bad.

I do not know enough about the internals to say it can't be done, but I would also imagine the seals are very tricky.

Best of luck.

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1986 300E 5-Speed 240k mi.