How do I fix my Tristar vacuum moved A101N, power brush?

Brush stopped abruptly when tangled with rug fringe. Reset button was pulled down into machine. Took it apart and repositioned the button in its hole in top of casing. No obvious hardware to hold it in place. I put the power brush back together, now reset button will not depress when pushed. No power to brush. What should I do to fix it?