I used a wooden pad under the base. (I did not want to drill holes in the base). It needs some fine-tuning. There is no space for mounting there, bolts are too close too the edge, so the pad flex up to 0,5mm. It has to be turned into metal or replaced by longer one, the heel pads need to be replaced then...Apart from the fact that the pad flex a little it works great. A HUGE increase in precision. There is no center "floppiness" now. I use it for fixed wing. It can be turned to helo setup easy without dismonting by tighten the TENSIONER screw (tiny hole in the side of the base) and setting required damper "power".
I used the same damper as with the MFG Replika Gear crosswind upgrade. (I recomend it to all MFG users)
You attach the damper to the central mounting that you have to do yourself, the end of the mounting can be purchased with the motorcycle damper kit (marked in green).
A some kind of gantry is also needed so that the damper does not fall on the base.
You also need a longer screw that comes out of the CAM, a set of nuts and washers ...
I wonder what effect will be created when the damper is mounted the opposing direction, but it is probably better to have the damper weight connected to the CAM instead of to the base. It has a more heavy/mechanical feel. it is also parallel to the base in the latter case it would have to be at an angle.