They would usually do that as a favor if u purchases your own strings ALL depends in their mood and how busy they are ....some times they won't....once I asked a Employee For a complimentary guitar pick. And instead he gave me a penny. It got me upset I reported it to the MGR. I gaurntee he doesn't work there anymore...So. Walk up to the right person ..
They can do a string change and set up for around $30 bucks
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