Mandrel assembly for use with a rotary tool

A mandrel assembly, comprising:

• a cylindrical collar including
• a collar first end,
• a collar second end that is opposite the first end, and
• a sidewall that extends between the collar first end and the collar second end, the sidewall including an inner surface that defines a bore, the intersection of the bore with the collar first end defining a first collar opening, the intersection of the bore with the collar second end defining a second collar opening, the bore having a step change in diameter that defines a collar inner shoulder;
• a mandrel including
• a mandrel first end that is disposed in the bore,
• a mandrel second end that is opposite the mandrel first end, the mandrel second end protruding from the collar second end, and
• a mandrel longitudinal axis that extends through the mandrel first end and the mandrel second end;
• a guide including
• a body portion that is disposed in the bore and secured to the mandrel first end, and
• a first post and a second post that protrude from the body portion in a direction parallel to the mandrel longitudinal axis, the first post being disposed on a side of the mandrel longitudinal axis that is diametrically opposed to the second post;
• an outer elastic member that extends from the mandrel first end to the collar inner shoulder and biases the collar first end away from the mandrel second end;
• and
• an inner elastic member that includes
• a base that is disposed between the first post and the second post and is fixed to the mandrel first end, and
• a spring arm that protrudes from the base and extends through the first collar opening, the spring arm configured to elastically deflect relative to the base in a direction perpendicular to the mandrel longitudinal axis.