Abstract: An advance plate assembly comprising a slim thickness, measured along the axis of the distributor, and comprising improved means to mount the assembly in the distributor housing. The invention also comprises one of a plurality of finger springs which hold the plate in any position securely, and yet permit easy changing of the position. Two different forms, one using set screws and the other using a split spring ring, to hold the assembly in the distributor housing are also disclosed. Improved means comprising a tongue on the finger spring which fits in a notch in the main bushing of the assembly is also disclosed.