Memoir Class - Modify ell chapter style

In the memoir class, how can I modify the format for the ell chapter style. In the manual, the code is not listed (unlike the other styles).

Basically in the above, all I want to do is make the horizontal and vertical line a little thicker and of a different colour.

I have been through the source code of the memoir package, but cannot find where the code is for this particular chapter style.

• In memoir.cls (version: 2016/05/16 v3.7f), I have \makechapterstyle{ell}{% at line 3321. – jon Mar 8 '17 at 22:32
• Well I just downloaded the source from ctan.org/tex-archive/macros/latex/contrib/memoir, and it doensn't contain a memoir.cls file. What am I missing? – Nicholas Hamilton Mar 9 '17 at 2:39
• Do you have memoir.ins? Run latex memoir.ins. But why are you downloading from CTAN? What version of memoir are you currently using? – jon Mar 9 '17 at 2:47
• I figured it out. Just looked for the local version installed by mactex, I thought downloading would be more convenient, as I just wanted to find the macro to redefine, anyway all good. – Nicholas Hamilton Mar 9 '17 at 4:57
• So would you be so kind and post it as an answer and accept it? Otherwise it appears under the unanswered questions – jjdb May 5 '17 at 10:23

This is how I ended up modifying it, the \chs@ell@helper command needed redefining:

%Modify the fancy chapter lines.
\makeatletter
\usepackage{array}
\newcolumntype{?}{!{\verticalrule}}
\renewcommand\chs@ell@helper[1]{%
\par%