There I was, happily blowing leaves, when my blower started varying in speed. Feeling particularly inquisitive I decided to dismantle it. Having finally realised the reason it wouldn't come apart was the screw I'd left in, it came apart neatly. The brush holder has two slots into which the powers supply blade slides. Or should have. Said blade was waving about, hence intermittent power. Searching eventually brought up a site with both brush holder & brush, so duly ordered. A battery powered replacement would have been nice but about five times the cost.