You need to undo the mechanism from the backside and pull the flywheel out. When you do that, the capstan needle will pull through. Watch for and catch the capstan needle washer that will likely fall off from the front side. Save it because you will replace that washer when you are done restoring that wheel. At this point, use lots of Q-tip swabs and isopropyl to remove all traces of the melted wheel. It could take a long time. Some guys like to use windex. I've never used windex but prefer not to use water based cleaners since it doesn't evaporate as quickly as the alcohol solvent. I also cut the tip off the swab and push the entire stick through since the goo is probably inside the bushing too. If you don't remove all traces of it -- it will contaminate and add drag to tne spinning needle. Once all that is done, you'll need to find an appropriately sized silicone tubing from a hobby store and snip a length to fit. Place it into that opening and push the capstan needle back through. Hopefully, it should thread through the tubing and be fat enough to drive the other wheel.