I just completed my first cast using Alumilite Clear and the 1" PVC as stated in another post. The blanks turned out great, but I had to cut the PVC from my blanks. I cleaned the PVC before casting and I put duck tape over one end and left the other end open and stood the PVC upright in a block of wood with holes drilled in it. Any ideas of why they didn't fall out on it's own as others have had it do? Any insight is appreciated. Thanks in advance!