Refinancing a collector car, is it worth it?

Got into my Aston a couple years ago at a higher rate. Has anyone refinanced a collector car to bring the rate down or pull a little equity out? How was the process?

I did a cash out refinance to help fund the next purchase. Needed an appraisal and a decent amount of equity, but it was smooth.

Worked for me, but they wanted 680 or higher credit and a certified appraisal. Plan for that up front.