club conformity

Question
Is it within the rules to place a small (1/4" or so) decal, piece of  tape, or paint mark on the top of the club head (irons and woods)?  It would not extend onto the face of the club, but it would be visible at address.  Since I have a variety of manufacturer's clubs in my bag, it's helpful to have a uniform mark to focus on, and it seems to help me hit the ball more on the sweet spot.  Thanks in advance.

Answer
Joe,

In reference to what I found it appears to that this would be an acceptable practice.

Decorative Markings

The center of the impact area may be indicated by a design within the boundary of a square whose sides are 0.375 inches (9.53 mm) in length. Such a design must not unduly influence the movement of the ball. Decorative markings are permitted outside the impact area.

e. Non-metallic Club Face Markings

The above specifications do not apply to clubheads made of wood on which the impact area of the face is of a material of hardness less than the hardness of metal and whose loft angle is 24 degrees or less, but markings which could unduly influence the movement of the ball are prohibited.

f. Putter Face Markings

Any markings on the face of a putter must not have sharp edges or raised lips. The specifications with regard to roughness, material and markings in the impact area do not apply.

Hope this helps.

Michael