```ruby
class Steermouse < Cask
  url 'http://plentycom.jp/ctrl/files_sm/SteerMouse4.1.9.dmg'
  homepage 'http://plentycom.jp/en/steermouse/'
  version '4.1.9'
  sha256 '4704aa8b01842c2e619db546fa045e515ee7e3a94d9d339f4650f2f8684b1280'
  install 'SteerMouse Installer.app/Contents/Resources/SteerMouse.pkg'
end
```

Add uninstall stanza for SteerMouse
user
```ruby
class Steermouse < Cask
  url 'http://plentycom.jp/ctrl/files_sm/SteerMouse4.1.9.dmg'
  homepage 'http://plentycom.jp/en/steermouse/'
  version '4.1.9'
  sha256 '4704aa8b01842c2e619db546fa045e515ee7e3a94d9d339f4650f2f8684b1280'
  install 'SteerMouse Installer.app/Contents/Resources/SteerMouse.pkg'
  uninstall :pkgutil => 'jp.plentycom.SteerMouse.pkg.*',
            :kext    => 'com.cyberic.SmoothMouse'
end
```
assistant