It's not got motor screws, the motor is clamped around its circumference.
Make sure the motor holder slides freely backwards and forwards without the motor in, then what I used to do was fit the motor in and only nip it with the clamp screw relatively loose still. Get the mesh so it's quite loose by sliding the motor back towards the spur, finally tighten the motor clamp screw tighter and it should bring the pinion closer to the spur......
......well it did in mine anyway
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