How to select gears for an angle grinder

How to select gears for an angle grinder

The outer diameter of the large driven part is measured with an accuracy of 2 mm.
It is not necessary to measure the outer diameter of the small leading one.
The height of the small leading one should be measured with an accuracy of 1-2 mm (in extreme cases, a washer should be placed underneath)
Measure internal diameters accurately with a caliper
The width of the transverse cut (if any) on the small drive shaft must correspond to the side cuts on the anchor shaft.
Since a reduction gear pair is sold, the number of teeth on the gears does not need to be taken into account.

Here you can select grinder gears by parameters