I fail to understand the working of the phds. The top part of the clamp is bolted down, so the is no chance of upward movement. The bar sit flat in the bottom part, so there is no downward movement.
The bolts and clamp prevent the bar from any movement.
Just cut out a piece of your std clamp and put a piece of rubber the with the bolt going through it. [emoji41]
Why don't you get something that buy something that make sense and works.
Fasst flexx has rubbers both sides and you can feel the up and downward movement.
The Mako 360. Never rode with them, but it make sense that it will work.