While unscrewing to charge the Batery , I lost one screw !!!

Need to buy a pair of Screws to replace the lost one, and have a spare.

I do not find accesorries for sale !

NO harware store has something to fit bottom of the doorbell.

Please infom how to buy it ?

Need urgent, the doorbell is loose


I am calling the Intl. 24/7 phone #er , Nobody answers !

Any other phone number ??