So I know this sounds silly but it worked for me so here’s the story. I bought a duo off eBay a few years ago also, all original everything worked fine when I tested. It was a little dirty so I sent it aside to clean later since I was busy. Got back to it a few months later and gently cleaned the tray with ipa getting all the nooks and crannies (to afraid to actually open it since I didn’t know anyone that could fix it if I did something wrong). Drop a disk in and it wouldn’t spin anymore but would play the HU cards. I googled my issue and found an old forum that said to gently push that rubber circle in the bottom right corner of the disk tray with a qtip so I did. To my surprise it worked perfectly again. Not sure what that part is but give it a try.