Hello to you!
It sounds as though your bellow fitted inside the push button model number 6442 which is a standard chrome button fitted to a white threaded body has a split or a tear in the bellow.
Please feel free to contact Herga Electrics on 01284-701422 or visit www.herga.com and drop us an email and we would be more then happy to supply you with a replacment.
Regards,
Bryan Southey
Bryan
April 2009