Most engineering supply stores will have some small stemmed wire brushes, usually called the end brushes. However not everyone may know what they are used for.
They come in different shapes and sizes and were originally designed for engine reconditioning jobs. But times have changed. There may not be as much reconditioning done as in the past and end brushes have become popular in many applications involving work in restricted or hard-to-reach areas such as dies, tubes, engines, pistons etc.
When considering the right brush for the application don’t look just at the brush diameter but also consider its full specification. It is important to realise that the wires will flare out during brush rotation. This means that the effective reach of the brush is increased. More importantly remember to first insert the brush into a hole before switching the power tool on!
Some brushes have been designed to work at very high speeds and can therefore be used on air powered tools and die grinders. Always check the maximum speed of the tool and of the brush before beginning a job.
Finally, as with most things not all the end brushes are created equal and you get what you pay for. So ask your local engineering supplies store for advice.
http://www.dixbro.co.nz/products/end-brushes
