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Depends what's wrong with it !! is it under warranty? ... change the fuse, brushes, bearings, clean the 'muck' off the commutator, lubricate it. If it's top-brand service it .... if it's a "cheapy"...bin it and get another "cheapy" or good used one.
If they are beyond repair, I cut them off with a thin metal cutting disc in an angle grinder.
Amazon is a pretty huge place in terms of products. They offer a lot of items with a discounted price. An individual looking to buy an angle grinder can find one there.
A protractor can be used to measure an angle.
Makita angle grinders are available from a variety of online shops, such as Screwfix, Tool-Net, Toolstop or Amazon. One could contact local DIY stores if one wanted to see one before purchasing.