updating the lines to address

https://github.com/How-To-Build-a-Commons/HowToBuildACommonsWorkbooks/issues/13

MakerCheck.tex

@@ -6,21 +6,19 @@
 	}
 }
 
-
 \newcommand{\verticallines}{%
 	\noindent%
 	\begin{tikzpicture}[remember picture, overlay]
 		\coordinate (TL) at (current page.north west);
 		\coordinate (BR) at (current page.south east);
 		\pgfmathsetmacro{\spacing}{0.8} % 8mm spacing in cm
-		\pgfmathsetmacro{\pagewidth}{\paperwidth/1cm}
+		\pgfmathsetmacro{\pagewidth}{8.5*2.54} % 8.5 inches converted to cm
 		\pgfmathsetmacro{\nlines}{int(\pagewidth/\spacing)}
 		\foreach \i in {0,1,...,\nlines}{
 			\draw[gray] ([xshift=\i*\spacing cm]TL) -- ([xshift=\i*\spacing cm]current page.south west);
 		}
 	\end{tikzpicture}%
 }
-
 \newcommand{\makercheck}{
 
 \begin{turn}{90}