Following the advice on this forum I added a switch to the front of the blackstone for easier access to turn the motor on/off.
I purchased a toggle switch, rubber boot and 5.5mm plug extension cord.
This let me avoid cutting the power adapter, making it easier to use any power adapter or remove it. Also didn't need to cut into the motor box. As this was a newer unit, I didn't need to revers the polarity to change the motor spin direction.
Word of caution, don't let your 6-year old tighten the nuts - he made scratches on the stainless.