Abstract: A gas distribution plate for a semiconductor processing apparatus includes a mounting plate having through-holes, and iris diaphragms or slotted apertures mounted over or in respective through-holes of the mounting plate. Each iris diaphragm or slotted aperture includes a motorized actuator operable to adjust the opening of the iris diaphragm or slotted aperture. In some embodiments, the gas distribution plate includes iris diaphragms, each including a hinge ring, a rotating ring, and iris leaves each having a first end coupled with the hinge ring and a second end opposite the first end slidably coupled with the rotating ring. If motorized, the motorized actuator may include a motor and a worm drive driven by the motor, with the worm drive operatively coupled with gear teeth disposed on the rotating ring.

Abstract: A method for manufacturing a golf club head having a weight member includes: providing a weight block made of a metal material; disposing an isolation layer on the weight block to form the weight member; delivering a wax material to form a wax pattern covering a portion of the weight member; coating the weight member and the wax pattern with a shell mold plaster to form a shell mold covering the same; performing a de-waxing process which leaves a mold cavity in the shell mold; and casting a molten metal material in the mold cavity to form a club head main body, and removing the shell mold to form the golf club head having the weight member embedded in the club head main body. A golf club head manufactured by the method is also disclosed.