+% Parts, in the main contents. Replace the part number, which doesn't
+% exist, with an empty box. Let's hope all the numbers have the same width.
+% Also ignore the page number, which is conventionally not printed.
+\def\numeralbox{\setbox0=\hbox{8}\hbox to \wd0{\hfil}}
+\def\partentry#1#2#3#4{\dochapentry{\numeralbox\labelspace#1}{}}
+%
+% Parts, in the short toc.
+\def\shortpartentry#1#2#3#4{%
+ \penalty-300
+ \vskip.5\baselineskip plus.15\baselineskip minus.1\baselineskip
+ \shortchapentry{#1}{\numeralbox}{}{}%
+}
+