No worries at all!
That sound is not harmful to anything but the ears perhaps.
Your engine will not mind a little glass-bottle-banging sound...never thought of that image before, but will next time....
....I often drive down into lower elevations and always just reset the dizzy by memory and listening, as the timing needs resetting with altitude changes.
If you would advance too much, you couldn't start your engine quiet as easily, as the ignition would fire too soon, before the piston is all the way up.
The sound just tells you how far you should advance. It is not any reason to be worried at all, as long as it's fairly slight and briefly. I tune it out, because I don't like the annoying sound, when I punch the gas pedal, when I need it.
The more advanced, the leaner the engine runs and the less gas you burn in the long run.
- You can advance too far and then the engine heats up or worse, if you went way too far...
But basically, the quieter and leaner the engine runs, the better and longer it will last.
The engine will also feel snappier and more responsive in city/town driving.
Have fun - finding the right timing has been a lot of fun over the years for me, going with different carb setups.
No special tools needed, just your right foot, your ears and driving your bolt all over the place and listening to the engine and how it responds.
