I've finally gone the DIY way for the Hi hat using Manfred's board so here is the installation :



The box is firmly attached to the Tama Speedcobra Hi hat stand using two screws already there to allow the rubber part to slide.
I should get another one and do proper hole now that I know where I should drill the box.
The magnet is tiny but quiet powerful. I think I have to change it because if I set the pedal to minimum, I start to have some weird triggering going on.
Otherwise, the board works like wonder wether I use a Yamaha 135 or Jman's A to E Hi hat.