Suggest you ask here which brands of under-drive pulley do not disintegrate. Some suffered catastrophic failure.
The TDC hole is useful for cam timing but it is not really intended for use when tightening the C/S bolt. Suggest you ask advice on this issue before trying to loosen the C/S bolt.It may be very tight +/- Loctite.
See post 17:
http://rennlist.com/forums/996-forum/814771-anyone-using-the-rss-underdrive-pulley-2.html