China/Tibetan sword. Help?

[Tim Simmons]

Just picked this up at a local junk market this morning. Surely an antique piece. Love the big cabochon red coral. Interesting stamped floral design to the brass sheeting on the scabbard but as you can see there is a problem. The blade is stuck to one side of the wood lining of the scabbard.

What can I do? Others have had this problem, did you and how did you solve the problem? For the time being I have squirted lots of plusgas into the scabbard concentrating on the stuck side. Would like to hear if this can be sorted. Thanks in advance of any useful tips.