I had trouble spinning brass sheet before. The brass came out of the scrap bin so was probably the wrong kind of brass for spinning as it work-hardened immediately it was bent. I managed to spin this brass lid properly, by annealing it many times during the spinning process. Here is the finished oiler lid together with a 100 year old original lid:
As in this earlier picture, I used this roller tool that I made, to turn the edge of the brass sheet. This time I removed the brass from the lathe for annealing, about six times, dunking it in water:
I did a few experiments and decided that with the brass sheet I had, it became softer if I heated it red hot and dunked it in water. That also was quicker than letting it cool by itself!