Use your battery box nut and bolt to hold the HICAP terminal securely against the OEM and slip the supplied black shrink tubing over both of them. You may need to cut the shrink tubing into short pieces and overlap them to build up the length and still get them over the 90° bend. Once the shrink tubing is shrunk down it will hold them together securely and you can remove the bolt and bolt both terminals down onto the battery post.