I recently purchased a used Zeta reg. It was serviced one week prior to me buying it. After a few dives, i noticed that the reg was flowing the slightest bit and would stop if I banged it lightly against my palm. I went back to the service tech and he said that he told the previous owner about this and that it was more an annoyance than anything else. I have no problems once the reg is in my mouth. Something to do with the lever in the second stage slightly binding. He also said it would cost $125 to fix. I am going to contact the previous owner and might ask for a refund. I know it is hard for you to comment on a reg you haven't seen but does all this sound reasonable? Is it crazy to keep using it as it is? Thanks. Gary