There is no binary called jwm_restart in /usr/bin. Am i missing something?
Which version of TC are you useing? Since TC 2.0 each window manager has interface files. The interface files for the window manager extensions are script files, not binaries.
the interface files for a window manager will be in either /usr/bin or /usr/local/bin, both of which should be in your PATH. So you can just use the command `jwm_restart`
If you are still using 1.X you can use `jwm -restart` as long as X is running.