Bill,
Yes. I've seen this movie already.
Note the spring that the tip of the pen is pointing at. It may be necessary to lift this spring slightly, with a dental pick or similar tool, and rotate the red band end of the safety button clockwise, so the flat on the shaft of the safety button that the spring is supposed to be in contact with is in proper position. Have a helper, wearing a leather glove (the machined ends are quite sharp) hold/support the block while you attempt the manuever.
Or send it to Kirk. He will give the gun a good once over with a strip and clean. A Darne really doesn't need this type of service that frequently, either.
Best,
Ted
