In a pinch, another homebrew solution to hold flywheel is to install
a longer bolt in one of the pressure plate bolt holes.

Then find a "double box" wrench (looks something like this):
http://www1.mscdirect.com/CGI/NNSRIT?PMPXNO=1666880&PMT4NO=0

Place one end of the wrench on the longer pressure plate bolt you installed.
The other end of wrench goes on one of the bottom engine studs.

I've done this multiple times with no ill effects.