u/DramaComprehensive74

Hello. I recently acquired this from eBay. Looks to be in amazing condition for its age. The issue I’m having is that when I tried to refill it with the adapter that is supposed to be for the yellow cap, all the butane escapes. Now given its age, I’m sure it’s overdue for service, but I was hoping I could make it work. Is it possible to replace the O ring visible on the valve without taking it apart? Would another tip work? And does any know the model year by any chance? TIA