I went to the local farm supply store. They have all kinds of syringes for horses and cows. I got one that is 80CC with a needle. I used lexan, a square about 5" or so. I drilled a small, like 1/8" hole way off center, where the edge of the chamber would fall. I slobbered up the head with white grease, put the lexan in place, and filled the chamber with a 50/50 mix of water and rubbing alcohol till it was full. I kept the hole at the top of the uphill side of the head (which was not quite level) to let all the air out. It was easy-peasy and maybe $10 total investment.
