Never had any problem here they even let me help them do it
Yes always tip something if they do the job for you its common curticy
Absolutely! Even a small yip is better than nothing. They work for low wages and i will often tip to give them a sense of a Job well done is worth their time being there!
Great work.
If you feel they did a good job yes, if they didn't, get it fixed and if they go about it in a manner conducive to good customer service tip then too
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