Could you tell me how to fix the compression coil spring so it doesn’t move?

Could you tell me how to fix the compression coil spring so it doesn’t move? When I did some research in various documents, it was said that the end of the compression coil spring can be fixed by fitting it into the counterbore hole or the washer for the coil spring. However, since the device under consideration is used at a higher than regular resonance frequency I feel that the above fixing method is unsafe. What kind of method is used to fix the coil spring end with a fixing jig? Thank you very much.