What your reed needs?
How is it sounds?
These descriptions does not mean that you have to apply these recommends on every reed to each point. The thicknesses and boldnesses ratios are described depending on the average so it can be suitable.
If the part 15 is too thick (when you compare with the back edges it makes reed hard, especially in the low register. Than you should scratch here but be careful if you scratch too much from the point 15 you will loosen the reed. If you think your reed is naturally too thick than scratch all over the reed (8) but DO NOT touch the 4th era this is the hearth of the reed.
If your reed sounds too soft or sounds like “zurna” it mostly means you scratched from the part 4 too much. To save the reed try to squeeze the second ring (11) than a little bit first ring(10) from the sides (hold the reed parallel to floor). If it is not enough you can cut off the point 5 for 0,5-1,00 mm to make the heart (4) become closer to the rings.
If it is hard to play in low register:
If the reed does not reacts easily in the low register scratch the back era of the reed (3) but mostly the sides of the back (1) and it will make the reed freer. The middle should be thicker than the sides and it should be seen like a mountain when you look from one side. If that is not enough you can scratch a little bit from the corners (8) but be careful it will make high register easier also. If the reed is already easy to play in high registers scratching more from that corners will make you loose the strenght of the reed.
If it is hard to play in high register:
First look at the opening of the reed it it is too open than it makes the high notes harder to play so tighten the first ring (11). Than if the reed still sounds heavy in high notes try to scratch 2nd era but be careful too mach scratching from the corners (2) makes harder to play staccato.