We are handling this informally. You do not have to use the DuckCall "exchange section" command (XS, 97) after it starts costing you $$ to do so. Here's what to do:
Go to the lab you want and ask the GTF if there's room for you. If
your GTF says Yes, make sure that s/he has your name removed from your
original lab and added to the new one. If the GTF says No, you will
have to attend a different lab.
emacs .cshrc
.cshrc file:
stty erase '^h'