Question Does the D3100 have diopter issues?

Mar 23, 2020
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Hi,
I'm looking to buy my 8 yr old daughter a used d3100 for her 9th birthday. Adorama has about 7 used ones at various condition grades from E- to G, but every single one says it has a malfunctioned diopter. Is this a common issue on the D3100? She's been playing around with my D5600 and much prefers the viewfinder vs the screen so it would be a deal breaker if she can't see through it. Just curious about this. Also, how hard is it to repair this at home if they do have a messed up diopter?
Thanks!
 

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