Yeah, the shank in the rounded part that you actually "stick" into the router.
Oh, and I'll give another vote for MCLS. I borrowed a slot cutter and router when I built my first cabinet in 1998, but this time around, I had my own router, and a slot cutter from MCLS. Worked awesome. No problems at all with t-molding staying put or anything.
I am helping 2 other guys with cabinets that they are going to be starting in a month or so, otherwise I would just sell you mine for cheap...
Nick