beartooth comb raising kit 2.0 ???

i'm gonna change the scope mount on my woodman patriot from marks 1 piece to his picatinny rail using leupold mark 4 rings .
i'm anticipating needing a cheek riser and the beartooth comb raising kit 2.0 has caught my eye .
it seems to have a rubber inside that helps it not slide or move on the gun stock so it's secure .
my question is .... do i need to worry about the rubber discoloring the laminated stock on my patriot ? 

and ..... has anyone used the beartooth comb raising kit 2.0 and what was/are your impressions using it ?
thanks , jeff