Evie.
The secret compartment is accessed by unscrewing the top part that the key ring is attached to . The whistle is at the other end and does not detach .I sell more without the whistle than the ones with it but a guy's gotta have variety ya know

There are many different variatins of the key ring . Some even have a little chain on them. The whistle is very shrill and loud sound meant as a security device.
Some are for storing pills in like this . Or some are perfume atomizers while others are for miniature screwdrivers.
PSI Woodworking Keychain Kits
There are thousands of neat things that can be made on a lathe that are good sellers at craft sales.
Back to the shop. . . . . . I have re-designed my stand a little since the picture and put some finish on it.
I have some scrollsawed desk name signs to make today from two separate orders from the previous sale . They are picking them up tomorrow and I am out of bottle stoppers again so I am going to make a bunch more of those this afternoon for tomorrows sale .
W.Y.