I have a cast iron bell from Rumsey & Co., Seneca Falls, NY. I’m looking for information, dimensions, etc. on the clapper, which is missing. The bell is over 13 inches high and almost 23 inches in diameter. The manufacturer’s name is cast into the yoke but I haven’t located any other markings. This bell came from a woolen mill (now gone) on the Battenkill River in Eagleville, NY, a small hamlet between Cambridge, NY and Arlington, VT. The mill was in my family for about a century.
A machine shop will be able to make a replacement of steel. The ball should be about 4 inches diameter on a 3/8 inch diameter rod and strike the thickest part of the lip. There’s probably a worn area already there that you can use as a guide.
On the Rumsey Co Sennica Falls no 8 church bell, the clapper is oblong like an egg. I have never seen a small one. I would say it would be kinda like CS farm bell clapper. The No 8 was over 32 inches wide at the lip and ran up a bit narrow at the top and was nearly 3 inches thick at the lip. Very heavy bell.