A filmed comparison
NOTE: We've noticed that it's a little hard to tell between the dampener and weight and will be re-filming with non-silent switches installed.
This a video showcasing between no-Internal Weight/Dampener, the Internal Dampener and the Internal Weight.
W01 Internal Weight
W02 Internal Dampener
Compatible with the M60-A and KOYU (cannot be used at the same time)
The sound was filmed using an array of stereo microphones. No post processing (i.e noise reduction) was used.