Mine cracked lengthwise, but did not fall apart in pieces. For an expedited field repair, I put a piece of 3/8" heat shrink tubing over it and shrunk it down. Works as long as the thing is not in pieces. As a makeshift till you get the replacement
tom
August 2012
Call your local Sears Parts Department. The part number is in fact 2615294309. It's called a coupler. Price is around $2.50 each. My local store (Hilo, HI) had two in stock. Another option is the Sears central parts distributor 1-800-469-4663. They wanted almost $20 for shipping. Nah.
Brad
April 2009
If you need the nylon coupling that connects the motor and the collet assembly they are available at 1-800-275-2052 for $2.25 each