Hi Joe,
If you search under the user name Arctic you will find lots of helpful pictures which tell the story.
By the way, they're called brushes because they sweep around the commutator. A bush is a simple type of bearing which, of course, is entirely different.
Buy them from Engineering Carbon Products Ltd. in the U.K. because these are based upon the OEM component and were developed with the assistance of club member Greeners and me! You'll need to buy a set of four and unfortunately the cost of international postage is rather high. However, you'll only need to do this job once. The alternative is e-bay but there have been reports that these only last five minutes so this option is not recommended.
Simon
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"Whatever is rightly done, however humble, is noble."
Sir Henry Royce.
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