Self-centering hole saw adapter

A self-centering hole saw adapter, for use in combination with a toothed edge hole saw having a shaft centrally disposed within the hole saw and connected thereto, and with said shaft having a portion thereof protruding beyond said toothed edge of said hole saw, comprising:

• a. a first member having a first hole therein and therethrough complementary to said centrally disposed shaft, with said first member removably mounted on and fitted over said shaft, through said first hole;
• b. a second member in the geometric form of a frustum of a right circular cone having a circular base with a diametric width;
• a circular section parallel to, oppositely disposed to, and less diametrically wider than, said base;
• and, a first hole therein and therethrough extending from said base to said parallel section, with said first hole complementary to said centrally disposed shaft, and with said first member removably mounted on and fitted over said shaft through said first hole, and also with said base of said second member facing said first member;
• c. and, an elastic and resilient body interposed between, and releasably interconnecting, said first member and said second member, with said body removably mounted on and fitted over said shaft;
• whereby said first member, said second member, and said elastic and resilient body are in alignment, are releasably interconnected, and form a one-piece unit, and whereby said one-piece unit is, in and of itself, removably mounted on and fitted over said shaft in either a "first member-up" position or a "second member-up" position, with said unit extending beyond said protruding portion of said shaft.