Sometimes I use 2 shims to make the razor more aggressive. Shims under the blade increase blade gap. I usually use shims with later Old Types (thick cap). But for my taste no shim necessary for thin cap Old Types.Do you use a shim? I'm not sure what they do to the shave, but I see people here doing that with Old Types to counter thinner modern blades or for some other effect. I'd rather not do this.