Re: Incorrect bell?
One part of Joe's circuit which you ought to include with anything beyond a replacement bell is the opto-isolator (IC1). It may be simpler, as I said previously, to replace the bell, either with a small bell internally - there are ones produced that are used to add a bell to telephones, such as GPO 232, which don't have an internal bell, but I can't find anything for sale currently - or use a separate plug-in bell/ringer, which is available for about £5.
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Mending is better than Ending (cf Brave New World by Aldous Huxley)
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