3. The surgical tool of claim 2 , further comprising: a spring connected between the elongate tube and the elongate shaft; and wherein the spring is configured to bias the elongate tube to the distal end of the elongated shaft; wherein the elongated tube has a grip at a proximal end adjacent the handle which allows the shaft to be slid toward the proximal end of the elongate shaft to operate the retainer to release the deflectable post.
3. The surgical tool of claim 2 , further comprising: a spring connected between the elongate tube and the elongate shaft; and wherein the spring is configured to bias the elongate tube to the distal end of the elongated shaft; wherein the elongated tube has a grip at a proximal end adjacent the handle which allows the shaft to be slid toward the proximal end of the elongate shaft to operate the retainer to release the deflectable post. 4. The surgical tool of claim 3 , wherein: the retainer is a ball, which is forced against the deflectable post when the elongate tube is positioned at the distal end of the elongate shaft, and which is released when the elongate tube is slid toward the proximal end of the elongate shaft.