Changing Timing belt Audi 80 need info, Pls

[Al Streicher]

I have been to Millers, Huws, Audifans and many other known sites that have
info, but not for the 1990 80,4 cylinder engine(3A).
My question is, According to the FA, I can see that all of the pullies come
off and the big 12 point bolt, that holds the timing belt gear in place,
does not need to be removed. Is that correct?
If that bolt has to be removed, how do I lock the crankshaft?

TIA,

Al

1990 80
Honolulu