If the starter motor only clicks and doesn't want to rotate, then the solenoid is broken or a few windings have burned out.
In most cases you will have to replace it in its entirety, a brand new one or a professionally overhauled starter is the best choice instead of a used one of which you don't know how long it will last.
For starter motors that are equipped with a starter bushing (mounted in the gearbox) it is possible that another starter motor has ever been fitted with a different shaft diameter, check the outside diameter of the old starter motor and order the right starter bushing as an extra (see tab options).
Not all starter motors are brand new, if the starter motor has been professionally overhauled, this will be mentioned in the description. Professionally overhauled starter motors are original Bosch and meet the same requirements as brand new.
A number of starter motors are also available in a B-quality (budget friendly but lower in quality), if available this is listed under the tab alternative.
Useful information from Paruzzi magazine and from our YouTube channel :
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