To prevent scratching the leveler I have chosen a 2-piece design with an inner part made of TPU. This inner part is not glued to the holder but only inserted. The leveler does not rest on the bottom surface of the insert, but on 5 small circumferential distributed support pads which also act as anti twist features ensuring correct positioning of the insert.
In order to increase the friction between the IKEA Skadis board and the holder I incorporated small shallow pockets on the rear side for small and thin (~1,5mm; I used this one) soft rubber pads so the holder will not move when the tamper is removed from the holder.
The author marked this model as their own original creation.