Sorry if the title is a bit vague but I recently got my hands on Jinhao Dadao as a gift for someone. But the pen skips on all the papers and some of the inks I have tried. Though this is one of the smoothest nib I've ever written with.

The seller is offering me a replacement nib but I'm not sure if it would work and if there’s a chance problem's with the feed drying out. Can I somehow rule this out?

I have a 14 days return period from Ali but if I accept the replacement nib it'll be over.