tenant fixed an issue. what would you do?

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Hi everyone. I have some new tenants that i moved in this month. They called me and said there was an issue with the toilet. however, theres a handyman in the house and they said they can fix it no problem. they replaced a piece and put it in without any issue. i will reimburse them for the piece they had to buy to fix it. 
In this case, would you give them anything on top of the reimbursement since you didn't have to go in and fix it yourself? the piece was around 20 bucks. how much would you give.
any feedback would be greatly appreciated. thank you