I took a 1 inch circumference doll rod and drilled a 3/4 inch circumference cone shape into it about 3/4 of an inch deep. I put a spray finish on it, sanded it down until super smooth, then put greensoap (3 coats) on it and made a one piece mold of it. it is roughly 6 inches long. I can not get the doll rod out of the plaster. I'm thinking it may be a suction issue. I poured the mold about 20 hours ago. I slapped it with a shoe. I drilled a hole in the doll rod (the 1/2 inch sticking out of the mold), and put a screw in it and tried to pull it out with about 150 lbs of pressure, and it wont budge. Does anyone have any suggestions? Thanks in advance.