Cant retract rear caliper pistons on '95 A6 - why screw?

[cobram at juno.com]

It's designed like that so you don't need mini-drums, shoes and related
hardware for the emergency brake setup.  The pistons rotate out to adjust
the emergency brake by compensating for pad wear. 

I bought the $5.99 "special" tool and it's worked just fine for me, never
had a problem, even here in the rust belt. 

BCNU,
http://www.geocities.com/cobramsri/
"God's a kid with an ant farm, lady. He's not planning anything."
 
"Tyson Varosyan" <tigran at tigran.com> writes:
> So can someone please explain to me the logic as to why these are 
> made in a way that you have to twist and push? Seems idiotic to me -
every 
> other car I have had, you just press them in. The fronts on this car
you just