Is it necessary to order servo motor with parallel key when using gearbox GBX with adaptation kit GBK?

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For gearboxes GBX and adaptation kits GBK it is not needed to use servo motor with parallel key. On the contrary, if motor had parallel key, it must be removed. For this reason it is better to buy motor with smooth shaft.
See instruction sheet in attachment.
As an example, find dwg 3D CAD file for Gearbox gbx060003k with gbk0600702f
It is dedicated for exanple for BSH0702P01A2 motor