Yes fellows no lube is required the piston is teflon impregnated to help it slide. The top voltage is 12 volts on the motor, but I have run them up to 16 volts. The manufacturer said you can do this but it will shorten the life of the motor. As for using the machine without a give spring this is ill advised for the needle pin will impact the top of the frame and cause metal to fall into the piston bore. Spring for the spring give set it will save the machine unnessasary wear and tare, at $20.00 US its well worth the money. You guys can email me any questions, I don't mind telling the secrets of the machines. It's what I'm here for, to help the industry, not hinder.