So, I finally got around to/got brave enough, to do the timing belt job on my girlfriend's 2001 Jetta. I'd done a few on the AHU motors, but never an ALH.
The Bentley claims that you need a special puller tool:
AST T 40001 cam puller that costs about $120-180.
I used Jack's home-made IP gear puller as shown here:
I bought if for all my 1.6 motors, but I found that you can loosen the two polts on the outer pins, rotate the slots to the same side, and it works perfectly on the cam gear on the ALH TDI. Incidentally, it also works well (with some finnagling) to remove stuck intermediate shaft pulleys.