Find the
place
After I dicide
what tone I should make better,
I must choose where is the best place to change.
In the instrument there are map of tones.
How do you find the map?
These are the scales of tone map.

choose the tone name and mark the place

small wodden piece

make sure the place is right place
then mark outside of the bell

this case I
should make decrease of the cross section of the marking place