I have had a few batches of bottled beers which lacked the normal carbonation. I suspect I may have worn the bell on my Agata capper. Found a supplier for replacement 26 mm bells. Ebay store, Olive Wood Brewing & Craft Co.
Also ordered the 29 mm bell just in case I come across free European bottles of this size. Total cost for two bells and shipping was $10.34.
Copied from Seller’s site: “This housing fits the ‘Emily’ bottle capper, Agata bench capper and Super Agata bench capper (Note: Fits only new style Agata cappers that take female bell housings).”