Hi. 
Today, I cut off a noisy bell from my microwave.

Before I begin, here is a word of warning. This repair can be dangerous. 

Do it at your own risk.

If you are not confident in your abilities, please ask a professional first or hire a professional to do it.

This is the bare minimum warning I can give you, but please unplug the power cord before carrying out this work.

Back to the subject.

This was a simple way.

Only take off the cover and give the bell some deals such as sticking a sticker on the top of the bell's surface or bending the bell.

I took the bending way and finally got the bell so silent!

Here is my video. （restricted for age）