For the most part, the authorized modifications covered in these Modified Rules of Golf are such that there is no allowance for modification to clubs, balls, devices or other equipment. However, there are some cases where a modification is required.
There are two cases where a modification to a club or other equipment could be allowed without consultation with the R&A or USGA, but only if the Committee is of the opinion that it is warranted and does not provide the player with an undue advantage.
Other grip modifications may be permitted under Rule 4.3b.(1), but in these instances it is highly recommended that the Committee consults with the R&A or USGA before giving an allowance.