Players who have a physical limitation, such as missing digits or other medical condition restricting the use of one or both hands, may be permitted to use grips on their clubs which do not meet the requirements of Part 2 Section 3 of the Equipment Rules, provided that the Local Committee determines that the player would not gain an undue advantage over other players. The grips to be used should be commercially available (e.g. putter grips) not modified in any way, and should not generally be manufactured in such a way that they would be considered to be a “training grip” i.e. a grip that is designed to place the hands in a consistent position or assist with the stroke.
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.