Toro Lleafblower repair?

Bought at a garage sale a TORO Rake and Vac model 51549 leaf blower. Worked twice then quit for good. Opened it up. The motor and switch are good. Between the switch "live" wire (+) and the motor is a black block of plastic with the live wire going in and a blue wire exiting to continue to to motor brush terminal. This part is open.
What is the function of this part and can I get a replacement, preferably generic from an electronics store? If not is there any downside to my just bypassing this part and connect the switch directly to the motor?
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