I believe that those are used when the pressure plate is assembled to setup the arms/fingers correctly. I've always been cautioned to not touch them. You may want to call a shop that rebuilds them and talk with them.
This is the contact information for the shop I have used.

Fleetpride
Roseville MN
651-636-4311

www.fleetpride.com

Last edited by don stocker; 01/25/2014 2:06 PM.