if you run out of water its like putting to much powder to water into you mixing bucket, the paddle starts to struggle and if you left it going it would burn the motor out like it would on your mixer. if you run out of powder then you will have a spot full of water and a right mess.. you dont need to buy the round spot. I use a standard spot and everytime one of you goes to the board you pull the fresh gear forward. Bod your wrong, if you have a run of hardwall to do then it will pay for itself and you will not be without it. If i can put mine back together i might sell it to you but i would want about 600 for it. I also have the extension for the hopper.