90Q Rear Brakes

[Bob Gregory <rggpa1@yahoo.com>]

I currently have my 88 90Q apart in the driveway while trying to
replace the rear pads.  No problem getting the old pads out but how to
push the piston (Girling single piston caliber) back in is a mystery. 
I know the piston has to be turned as its being pushed but the piston
does not have a female hex in it like my 84 4000Q.  Instead it has two
small notches on the outer edge of the "equator" of the piston head. 
Is there a tool available (where and how much) to grab these notches? 
Or is this notched piece a cover over the hex head?

And......the stock pads had a removable plate between the pad and the
piston.  Should I use them with the replacements?  The Rofrens I will
be using did not provide these plates.  (BTW, I now know, after buying
them, that the Rofrens are supposed to be pretty tough on the rotors. 
I plan on being a rolling test lab.)

TIA


_________________________________________________________
Do You Yahoo!?
Get your free @yahoo.com address at http://mail.yahoo.com