You should insert the knobs into the encoders before closing the case. Push the knobs into the encoders while pushing the PCB with the finger from the rear side. This will avoid putting too much pressure on the encoders, which can break them. The knobs can be very tight, and a bit of water can be used as lubricant to help with this. Better skill than strength.
+
You should insert the knobs into the encoders before closing the case. Push each knob into the encoder while pushing the PCB with the finger from the rear side. This will avoid putting too much pressure on the encoders, which can break them. The knobs can be very tight, and a bit of water/oil can be used as lubricant to help with this. '''Better skill than strength.'''