What I do is get an old mouse pad (the squishy kind) and cut it into strips that are just a bit wider than the top of the comb. Layer the strips on until you get the right high. then I tape them all together. I finish this off by placing a stock pack over the whole thing. It gives me the height I need and it is reversible/adjustable if you ever change things. I also like that it is a soft material so when I place the full weight of my head on the stock I do not feel the hard surface pressing against my cheekbone.