Wanted: 5200 Trak-Ball Controller

I posted this in the Tempest 5200 thread, but I figured I'd start a new thread for more exposure.  

I need to spend some time testing Tempest 5200 with the Trak-Ball controller, which I planned on doing this evening.  Unfortunately, I discovered that the Trak-Ball controller I recently bought on eBay doesn't work properly.  I swear I tested it when I received it a month ago, so not sure what's up with that.  Does anyone have a known working Trak-Ball controller they can either loan me or sell me?

Thanks,

..Al