The first two lids...



After parting off the jar, I used the shape left from the undercut to make the top of the lid. I measured the the diameter of the inside of the jar then used calipers to measure the diameter of the lid as I turned it.



The second two lids...



I shaped the lids with the bottom of the lid facing out. This was useful for two reasons. One, rather than measuring the diameter of the jar and lid, I was able to check their fit as I went. Two, it allowed me to use the partially formed lid to hold the the jar on the lathe while i sanded and finished it from the bottom. (This is a little confusing to explain - see pictures for clarification.)



Then...

Sanded, oiled, and parted the lids off the lathe.





