If Im working on a axle I use 4 C clamps or a set of used U bolts to hold the axle to the stand. works easy for breaking down or building up a axle. The T- tops are removable for a set of Y tips, never used them though.
I have a really bitchen set up I use for axles, will post up some pics this weekend, adjusts for different widths and mounting types, all out of some 1 1/2 square tube and Harbor Freight wheels.