MDF is not great for small patterns but it did the job, the hard part was getting the shape of the bell cover button cavity. So as I did with the aluminum handle pattern (another project) I cut it into 4 parts, that makes it easier to get the mold out without breaking the sand. As for the button I shaped a small part of hard wood. After opening the flask I cut off the sprue and riser, I was lucky there was only a bit of shrinkage on the back of the bell cover because I was a bit short of molten aluminum. Some cleaning a bit of polish and It looks great.
