This may look like an ordinary “Attack Shark” M87 Pro keyboard.
But it’s not.
The empty interior spaces have been filled with sorbothane, to give it a deeper and thockier sound profile.
The stabilizers have been retuned, such that the caps fit perfectly level.
And most important, the stock linears have been replaced with hand-customized AKKO POM Brown switches:
The POM Browns were carefully hand-lubed with 3204, enough to reduce any factory scratch, while maintaining their tactile shape. The springs were replaced with Geon 50 G 18mm springs.
I found that, after storage, the stock POM Browns had become a little scratchy. The springs especially were contributing to a dry, scratchy sound. So I figured that the Geon springs, listed at similar weight, would be a much better replacement.
They turned out better than anyone expected. I sent the keyboard in for professional rebuild, as the POM Browns were fine work. A special, spring mixed-lube was used. The POM Browns have lost most of their scratch now, and feel the same. Maybe smoother and more consistent. These are the best possible POM Browns that you could build at this weight.
The keyboard sounds comparable to a ‘factory thock’ TKL like the LINK87.
Sound Test:
LINK87 for comparison: