No waaay to small.You cant apply pressure with a dremmell.If you sand correctly the aluminum will almost be shiny before you buff.For the buffing prossess I use a much bigger shaft on my drill so I can lean into it!!This where the chrome like finish comes in.I use two drills.One to apply the rouge (RE cutting wax) the second one to take the rouge off.I finish with over the counter aluminum polish = Mothers
Sorry I dont know your experence level.You under stand your going to apply the rouge to the spinning felt bob then apply the spinning felt bob to your clean and sanded part.
Earler I posted polishing polishing forks on the bike.that post is still here,you should find it.It will help you!!Please feel free to ask any questions here.I would be glad to answer them for you.
The best way is to use a buffer if you want to take the time.