This .335-.350 perforated adapter ferrule has become the industry standard for the clubmaking trade. If you've got an OEM clubhead that originally took a .350 shaft and now you want to use an aftermarket .335 shaft, this is a very easy solution and creates a strong bond. Don't just use epoxy to fill the void, it can fail! Here is a easy, foolproof solution. The perforation allows the epoxy to bond between the prepped shaft tip and the prepped hosel insuring a strong bond. Dry-fit first, then epoxy everything at once.