That’s similar to a list I seen. Look at the CC’s it’s listing for those heads. Unless I’m doing something terribly wrong that’s way off. I used a peice of plexiglass and syringe to measure, I done it more than once and came up with 75. I agree with buying another set adding to the overall cost of doing machine work but what I meant was, if they do the machine work for that price and I found a better choice in head for a reasonable price would I be better off? Would you put money in those heads if you had them I guess is what I’m saying. Thank you very much for your help and input.