Hi Philip and Stu
I didn't realize there was an additional post on this Thread.
After further thought, I believe the small hole had some type of pin device that was inserted to keep the serpentine arm positioned in a right-ward position so as to align the matchcord with the center of the pan while in use. What the device would look like I have no idea.
Speaking of vent picks.....I have 4/5 original Torador style vent picks in my collection. So I think I'll use one to suspend on this gun, making the lock area even more crowded. LOL
After a couple minor repairs and cleaning, and replacing the missing stones, this should turn out nice. Glad I found this one.
Rick