Razer Viper V2 PRO MOD-KIT instructions
It is possible that there is left-over powder in the whole for the side button PCB. Remove it with something pointy [Green arrow]. If there is too much pretravel on the sidebuttons try bending those inwards without the side button PCB in place.
It is possible that a mouse button is constantly activated. The solution is to slightly sand the hook of the top shell or file the parts that the hooks lock in to in the bottom shell like shown in the following 2 pictures.
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